221021022122121 has 16 divisors (see below), whose sum is σ = 322742561641920. Its totient is φ = 133707632677440.

The previous prime is 221021022122113. The next prime is 221021022122141. The reversal of 221021022122121 is 121221220120122.

It is not a de Polignac number, because 221021022122121 - 2³ = 221021022122113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221021022122141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48027164610 + ... + 48027169211.

It is an arithmetic number, because the mean of its divisors is an integer number (20171410102620).

Almost surely, 2^{221021022122121} is an apocalyptic number.

It is an amenable number.

221021022122121 is a deficient number, since it is larger than the sum of its proper divisors (101721539519799).

221021022122121 is a wasteful number, since it uses less digits than its factorization.

221021022122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96054333896.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221021022122121 its reverse (121221220120122), we get a palindrome (342242242242243).

The spelling of 221021022122121 in words is "two hundred twenty-one trillion, twenty-one billion, twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".