20101000222221 has 16 divisors (see below), whose sum is σ = 27442077527040. Its totient is φ = 13080691617840.

The previous prime is 20101000222187. The next prime is 20101000222229. The reversal of 20101000222221 is 12222200010102.

It is not a de Polignac number, because 20101000222221 - 2⁶ = 20101000222157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20101000222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101000222229) 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, 49390501 + ... + 49795818.

It is an arithmetic number, because the mean of its divisors is an integer number (1715129845440).

Almost surely, 2^{20101000222221} is an apocalyptic number.

It is an amenable number.

20101000222221 is a deficient number, since it is larger than the sum of its proper divisors (7341077304819).

20101000222221 is a wasteful number, since it uses less digits than its factorization.

20101000222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99187936.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20101000222221 its reverse (12222200010102), we get a palindrome (32323200232323).

The spelling of 20101000222221 in words is "twenty trillion, one hundred one billion, two hundred twenty-two thousand, two hundred twenty-one".