221321324312 has 16 divisors (see below), whose sum is σ = 452702709000. Its totient is φ = 100600601920.

The previous prime is 221321324183. The next prime is 221321324347. The reversal of 221321324312 is 213423123122.

It is a congruent number.

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, 1257507437 + ... + 1257507612.

Almost surely, 2^221321324312 is an apocalyptic number.

221321324312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221321324312 is an abundant number, since it is smaller than the sum of its proper divisors (231381384688).

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

221321324312 is a wasteful number, since it uses less digits than its factorization.

221321324312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515015066 (or 2515015062 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

Adding to 221321324312 its reverse (213423123122), we get a palindrome (434744447434).

The spelling of 221321324312 in words is "two hundred twenty-one billion, three hundred twenty-one million, three hundred twenty-four thousand, three hundred twelve".