221021022122122 has 16 divisors (see below), whose sum is σ = 333760848993000. Its totient is φ = 109767424777920.

The previous prime is 221021022122113. The next prime is 221021022122141. The reversal of 221021022122122 is 221221220120122.

It can be written as a sum of positive squares in 4 ways, for example, as 77849052350521 + 143171969771601 = 8823211^2 + 11965449^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221021022122093 and 221021022122102.

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, 18769504 + ... + 28183972.

Almost surely, 2^{221021022122122} is an apocalyptic number.

221021022122122 is a deficient number, since it is larger than the sum of its proper divisors (112739826870878).

221021022122122 is a wasteful number, since it uses less digits than its factorization.

221021022122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9493401.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221021022122122 its reverse (221221220120122), we get a palindrome (442242242242244).

The spelling of 221021022122122 in words is "two hundred twenty-one trillion, twenty-one billion, twenty-two million, one hundred twenty-two thousand, one hundred twenty-two".