221323100312 has 32 divisors (see below), whose sum is σ = 419695700400. Its totient is φ = 109404556800.

The previous prime is 221323100311. The next prime is 221323100321. The reversal of 221323100312 is 213001323122.

It is a super-2 number, since 2×221323100312² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221323100311) 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, 8111012 + ... + 8138252.

Almost surely, 2^221323100312 is an apocalyptic number.

It is an amenable number.

221323100312 is a deficient number, since it is larger than the sum of its proper divisors (198372600088).

221323100312 is a wasteful number, since it uses less digits than its factorization.

221323100312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38747 (or 38743 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 221323100312 its reverse (213001323122), we get a palindrome (434324423434).

The spelling of 221323100312 in words is "two hundred twenty-one billion, three hundred twenty-three million, one hundred thousand, three hundred twelve".