221512256512 has 44 divisors (see below), whose sum is σ = 468855770040. Its totient is φ = 104241053696.

The previous prime is 221512256509. The next prime is 221512256521. The reversal of 221512256512 is 215652215122.

It is a super-2 number, since 2×221512256512² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6344962 + ... + 6379777.

Almost surely, 2^221512256512 is an apocalyptic number.

It is an amenable number.

221512256512 is an abundant number, since it is smaller than the sum of its proper divisors (247343513528).

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

221512256512 is a wasteful number, since it uses less digits than its factorization.

221512256512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12724776 (or 12724758 counting only the distinct ones).

The product of its digits is 24000, while the sum is 34.

The spelling of 221512256512 in words is "two hundred twenty-one billion, five hundred twelve million, two hundred fifty-six thousand, five hundred twelve".