21610404111216 has 80 divisors (see below), whose sum is σ = 59728496992640. Its totient is φ = 6712463727360.

The previous prime is 21610404111203. The next prime is 21610404111217. The reversal of 21610404111216 is 61211140401612.

It is a super-2 number, since 2×21610404111216² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21610404111217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194170750 + ... + 194282013.

It is an arithmetic number, because the mean of its divisors is an integer number (746606212408).

Almost surely, 2^{21610404111216} is an apocalyptic number.

It is an amenable number.

21610404111216 is an abundant number, since it is smaller than the sum of its proper divisors (38118092881424).

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

21610404111216 is a wasteful number, since it uses less digits than its factorization.

21610404111216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388452854 (or 388452848 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

Adding to 21610404111216 its reverse (61211140401612), we get a palindrome (82821544512828).

The spelling of 21610404111216 in words is "twenty-one trillion, six hundred ten billion, four hundred four million, one hundred eleven thousand, two hundred sixteen".