21216601261232 has 40 divisors (see below), whose sum is σ = 45104523531984. Its totient is φ = 9607517547264.

The previous prime is 21216601261231. The next prime is 21216601261243. The reversal of 21216601261232 is 23216210661212.

It is a super-2 number, since 2×21216601261232² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21216601261192 and 21216601261201.

It is not an unprimeable number, because it can be changed into a prime (21216601261231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 962280398 + ... + 962302445.

Almost surely, 2^{21216601261232} is an apocalyptic number.

It is an amenable number.

21216601261232 is an abundant number, since it is smaller than the sum of its proper divisors (23887922270752).

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

21216601261232 is a wasteful number, since it uses less digits than its factorization.

21216601261232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924582917 (or 1924582911 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 21216601261232 in words is "twenty-one trillion, two hundred sixteen billion, six hundred one million, two hundred sixty-one thousand, two hundred thirty-two".