21885693429936 has 80 divisors (see below), whose sum is σ = 64769117011200. Its totient is φ = 6238131465984.

The previous prime is 21885693429913. The next prime is 21885693429937. The reversal of 21885693429936 is 63992439658812.

It is a super-2 number, since 2×21885693429936² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21885693429937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77587131 + ... + 77868698.

It is an arithmetic number, because the mean of its divisors is an integer number (809613962640).

Almost surely, 2^{21885693429936} is an apocalyptic number.

It is an amenable number.

21885693429936 is an abundant number, since it is smaller than the sum of its proper divisors (42883423581264).

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

21885693429936 is a wasteful number, since it uses less digits than its factorization.

21885693429936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155456266 (or 155456260 counting only the distinct ones).

The product of its digits is 1209323520, while the sum is 75.

The spelling of 21885693429936 in words is "twenty-one trillion, eight hundred eighty-five billion, six hundred ninety-three million, four hundred twenty-nine thousand, nine hundred thirty-six".