221021242120121 has 8 divisors (see below), whose sum is σ = 223427630808480. Its totient is φ = 218617461986688.

The previous prime is 221021242120043. The next prime is 221021242120169. The reversal of 221021242120121 is 121021242120122.

It is a happy number.

221021242120121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-221021242120121 is a prime.

It is a super-2 number, since 2×221021242120121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021242125121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 651968351 + ... + 652307268.

It is an arithmetic number, because the mean of its divisors is an integer number (27928453851060).

Almost surely, 2^{221021242120121} is an apocalyptic number.

It is an amenable number.

221021242120121 is a deficient number, since it is larger than the sum of its proper divisors (2406388688359).

221021242120121 is a wasteful number, since it uses less digits than its factorization.

221021242120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304277463.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 221021242120121 its reverse (121021242120122), we get a palindrome (342042484240243).

Subtracting from 221021242120121 its reverse (121021242120122), we obtain a palindrome (99999999999999).

The spelling of 221021242120121 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred forty-two million, one hundred twenty thousand, one hundred twenty-one".