221002010121 has 16 divisors (see below), whose sum is σ = 300375541760. Its totient is φ = 144506278800.

The previous prime is 221002010111. The next prime is 221002010167. The reversal of 221002010121 is 121010200122.

It is not a de Polignac number, because 221002010121 - 2⁷ = 221002009993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221002010097 and 221002010106.

It is not an unprimeable number, because it can be changed into a prime (221002010111) 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, 3051955 + ... + 3123528.

It is an arithmetic number, because the mean of its divisors is an integer number (18773471360).

Almost surely, 2^221002010121 is an apocalyptic number.

It is an amenable number.

221002010121 is a deficient number, since it is larger than the sum of its proper divisors (79373531639).

221002010121 is a wasteful number, since it uses less digits than its factorization.

221002010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6175716.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221002010121 its reverse (121010200122), we get a palindrome (342012210243).

The spelling of 221002010121 in words is "two hundred twenty-one billion, two million, ten thousand, one hundred twenty-one".