21437837686572 has 288 divisors, whose sum is σ = 53432170767360. Its totient is φ = 6685137930240.

The previous prime is 21437837686567. The next prime is 21437837686607. The reversal of 21437837686572 is 27568673873412.

It is a super-2 number, since 2×21437837686572² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21437837686497 and 21437837686506.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17414977197 + ... + 17414978427.

It is an arithmetic number, because the mean of its divisors is an integer number (185528370720).

Almost surely, 2^{21437837686572} is an apocalyptic number.

It is an amenable number.

21437837686572 is an abundant number, since it is smaller than the sum of its proper divisors (31994333080788).

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

21437837686572 is a wasteful number, since it uses less digits than its factorization.

21437837686572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721 (or 1682 counting only the distinct ones).

The product of its digits is 568995840, while the sum is 69.

The spelling of 21437837686572 in words is "twenty-one trillion, four hundred thirty-seven billion, eight hundred thirty-seven million, six hundred eighty-six thousand, five hundred seventy-two".