221020120120121 has 32 divisors (see below), whose sum is σ = 271349416800000. Its totient is φ = 179452330315776.

The previous prime is 221020120120049. The next prime is 221020120120133. The reversal of 221020120120121 is 121021021020122.

221020120120121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-221020120120121 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221020120120121.

It is not an unprimeable number, because it can be changed into a prime (221020120120141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49588955 + ... + 53861903.

It is an arithmetic number, because the mean of its divisors is an integer number (8479669275000).

Almost surely, 2^{221020120120121} is an apocalyptic number.

It is an amenable number.

221020120120121 is a deficient number, since it is larger than the sum of its proper divisors (50329296679879).

221020120120121 is an equidigital number, since it uses as much as digits as its factorization.

221020120120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4280926 (or 4280912 counting only the distinct ones).

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

Adding to 221020120120121 its reverse (121021021020122), we get a palindrome (342041141140243).

Subtracting from 221020120120121 its reverse (121021021020122), we obtain a palindrome (99999099099999).

The spelling of 221020120120121 in words is "two hundred twenty-one trillion, twenty billion, one hundred twenty million, one hundred twenty thousand, one hundred twenty-one".