21216532065104 has 20 divisors (see below), whose sum is σ = 41109632582976. Its totient is φ = 10607594624352.

The previous prime is 21216532065103. The next prime is 21216532065137. The reversal of 21216532065104 is 40156023561212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216532065103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41702264 + ... + 42207959.

Almost surely, 2^{21216532065104} is an apocalyptic number.

It is an amenable number.

21216532065104 is a deficient number, since it is larger than the sum of its proper divisors (19893100517872).

21216532065104 is a wasteful number, since it uses less digits than its factorization.

21216532065104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83926034 (or 83926028 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 21216532065104 in words is "twenty-one trillion, two hundred sixteen billion, five hundred thirty-two million, sixty-five thousand, one hundred four".