221002100122121 has 4 divisors (see below), whose sum is σ = 222159179180544. Its totient is φ = 219845021063700.

The previous prime is 221002100122087. The next prime is 221002100122127. The reversal of 221002100122121 is 121221001200122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221002100122121 - 2²² = 221002095927817 is a prime.

It is a super-2 number, since 2×221002100122121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221002100122121.

It is not an unprimeable number, because it can be changed into a prime (221002100122127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578539528925 + ... + 578539529306.

It is an arithmetic number, because the mean of its divisors is an integer number (55539794795136).

Almost surely, 2^{221002100122121} is an apocalyptic number.

It is an amenable number.

221002100122121 is a deficient number, since it is larger than the sum of its proper divisors (1157079058423).

221002100122121 is a wasteful number, since it uses less digits than its factorization.

221002100122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157079058422.

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

Adding to 221002100122121 its reverse (121221001200122), we get a palindrome (342223101322243).

The spelling of 221002100122121 in words is "two hundred twenty-one trillion, two billion, one hundred million, one hundred twenty-two thousand, one hundred twenty-one".