21356676040 has 128 divisors (see below), whose sum is σ = 56043187200. Its totient is φ = 7173031680.

The previous prime is 21356675993. The next prime is 21356676041. The reversal of 21356676040 is 4067665312.

It is a super-2 number, since 2×21356676040² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 21356675984 and 21356676002.

It is not an unprimeable number, because it can be changed into a prime (21356676041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5069535 + ... + 5073745.

It is an arithmetic number, because the mean of its divisors is an integer number (437837400).

Almost surely, 2^21356676040 is an apocalyptic number.

21356676040 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 21356676040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28021593600).

21356676040 is an abundant number, since it is smaller than the sum of its proper divisors (34686511160).

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

21356676040 is a wasteful number, since it uses less digits than its factorization.

21356676040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4595 (or 4591 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 21356676040 in words is "twenty-one billion, three hundred fifty-six million, six hundred seventy-six thousand, forty".