21516232107156 has 96 divisors (see below), whose sum is σ = 51174217801728. Its totient is φ = 7034636757120.

The previous prime is 21516232107131. The next prime is 21516232107157. The reversal of 21516232107156 is 65170123261512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21516232107157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 289326730 + ... + 289401086.

It is an arithmetic number, because the mean of its divisors is an integer number (533064768768).

Almost surely, 2^{21516232107156} is an apocalyptic number.

It is an amenable number.

21516232107156 is an abundant number, since it is smaller than the sum of its proper divisors (29657985694572).

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

21516232107156 is a wasteful number, since it uses less digits than its factorization.

21516232107156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76181 (or 76179 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

Adding to 21516232107156 its reverse (65170123261512), we get a palindrome (86686355368668).

The spelling of 21516232107156 in words is "twenty-one trillion, five hundred sixteen billion, two hundred thirty-two million, one hundred seven thousand, one hundred fifty-six".