221021323012 has 24 divisors (see below), whose sum is σ = 442052959040. Its totient is φ = 94721214240.

The previous prime is 221021322989. The next prime is 221021323037. The reversal of 221021323012 is 210323120122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1842814 + ... + 1959082.

Almost surely, 2^221021323012 is an apocalyptic number.

It is an amenable number.

221021323012 is an abundant number, since it is smaller than the sum of its proper divisors (221031636028).

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

221021323012 is a wasteful number, since it uses less digits than its factorization.

221021323012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184171 (or 184169 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 221021323012 its reverse (210323120122), we get a palindrome (431344443134).

The spelling of 221021323012 in words is "two hundred twenty-one billion, twenty-one million, three hundred twenty-three thousand, twelve".