210121102221 has 16 divisors (see below), whose sum is σ = 289904482560. Its totient is φ = 135211970880.

The previous prime is 210121102211. The next prime is 210121102237. The reversal of 210121102221 is 122201121012.

It is not a de Polignac number, because 210121102221 - 2⁶ = 210121102157 is a prime.

It is a super-2 number, since 2×210121102221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 210121102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121102211) 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, 32965 + ... + 649098.

It is an arithmetic number, because the mean of its divisors is an integer number (18119030160).

Almost surely, 2^210121102221 is an apocalyptic number.

It is an amenable number.

210121102221 is a deficient number, since it is larger than the sum of its proper divisors (79783380339).

210121102221 is a wasteful number, since it uses less digits than its factorization.

210121102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685636.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 210121102221 its reverse (122201121012), we get a palindrome (332322223233).

The spelling of 210121102221 in words is "two hundred ten billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty-one".