221512256513 has 8 divisors (see below), whose sum is σ = 221990039040. Its totient is φ = 221034816720.

The previous prime is 221512256509. The next prime is 221512256521. The reversal of 221512256513 is 315652215122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221512256513 - 2² = 221512256509 is a prime.

It is a super-2 number, since 2×221512256513² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221512256543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230023 + ... + 1398563.

It is an arithmetic number, because the mean of its divisors is an integer number (27748754880).

Almost surely, 2^221512256513 is an apocalyptic number.

It is an amenable number.

221512256513 is a deficient number, since it is larger than the sum of its proper divisors (477782527).

221512256513 is a wasteful number, since it uses less digits than its factorization.

221512256513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171367.

The product of its digits is 36000, while the sum is 35.

The spelling of 221512256513 in words is "two hundred twenty-one billion, five hundred twelve million, two hundred fifty-six thousand, five hundred thirteen".