21144332112040 has 64 divisors (see below), whose sum is σ = 49675183891200. Its totient is φ = 8084795507712.

The previous prime is 21144332111963. The next prime is 21144332112049. The reversal of 21144332112040 is 4021123344112.

It is a happy number.

It is a super-2 number, since 2×21144332112040² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21144332112049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5970780 + ... + 8828299.

It is an arithmetic number, because the mean of its divisors is an integer number (776174748300).

Almost surely, 2^{21144332112040} is an apocalyptic number.

21144332112040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21144332112040 is an abundant number, since it is smaller than the sum of its proper divisors (28530851779160).

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

21144332112040 is a wasteful number, since it uses less digits than its factorization.

21144332112040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14800666 (or 14800662 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21144332112040 its reverse (4021123344112), we get a palindrome (25165455456152).

The spelling of 21144332112040 in words is "twenty-one trillion, one hundred forty-four billion, three hundred thirty-two million, one hundred twelve thousand, forty".