21935615629872 has 40 divisors (see below), whose sum is σ = 64762293765376. Its totient is φ = 6267318751296.

The previous prime is 21935615629843. The next prime is 21935615629897. The reversal of 21935615629872 is 27892651653912.

It is a super-2 number, since 2×21935615629872² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32642284828 + ... + 32642285499.

Almost surely, 2^{21935615629872} is an apocalyptic number.

It is an amenable number.

21935615629872 is an abundant number, since it is smaller than the sum of its proper divisors (42826678135504).

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

21935615629872 is a wasteful number, since it uses less digits than its factorization.

21935615629872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65284570345 (or 65284570339 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 66.

The spelling of 21935615629872 in words is "twenty-one trillion, nine hundred thirty-five billion, six hundred fifteen million, six hundred twenty-nine thousand, eight hundred seventy-two".