221021000212112 has 20 divisors (see below), whose sum is σ = 432642911500716. Its totient is φ = 109371216599040.

The previous prime is 221021000212049. The next prime is 221021000212123. The reversal of 221021000212112 is 211212000120122.

It can be written as a sum of positive squares in 2 ways, for example, as 95802125076736 + 125218875135376 = 9787856^2 + 11190124^2 .

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, 71205217589 + ... + 71205220692.

Almost surely, 2^{221021000212112} is an apocalyptic number.

It is an amenable number.

221021000212112 is a deficient number, since it is larger than the sum of its proper divisors (211621911288604).

221021000212112 is a wasteful number, since it uses less digits than its factorization.

221021000212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142410438386 (or 142410438380 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221021000212112 its reverse (211212000120122), we get a palindrome (432233000332234).

The spelling of 221021000212112 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twelve thousand, one hundred twelve".