21174124802040 has 512 divisors, whose sum is σ = 86641632000000. Its totient is φ = 4585072117248.

The previous prime is 21174124802029. The next prime is 21174124802041. The reversal of 21174124802040 is 4020842147112.

It is a happy number.

21174124802040 is a `hidden beast` number, since 2 + 1 + 174 + 1 + 2 + 480 + 2 + 0 + 4 + 0 = 666.

It is a super-2 number, since 2×21174124802040² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21174124801986 and 21174124802004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21174124802041) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5534166 + ... + 8542554.

It is an arithmetic number, because the mean of its divisors is an integer number (169221937500).

Almost surely, 2^{21174124802040} is an apocalyptic number.

21174124802040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21174124802040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43320816000000).

21174124802040 is an abundant number, since it is smaller than the sum of its proper divisors (65467507197960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21174124802040 is a wasteful number, since it uses less digits than its factorization.

21174124802040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3008449 (or 3008425 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

Adding to 21174124802040 its reverse (4020842147112), we get a palindrome (25194966949152).

The spelling of 21174124802040 in words is "twenty-one trillion, one hundred seventy-four billion, one hundred twenty-four million, eight hundred two thousand, forty".