20002100222221 has 48 divisors (see below), whose sum is σ = 23781478409920. Its totient is φ = 16668210585600.

The previous prime is 20002100222207. The next prime is 20002100222227. The reversal of 20002100222221 is 12222200120002.

It is not a de Polignac number, because 20002100222221 - 2³⁵ = 19967740483853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20002100222195 and 20002100222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002100222227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17293741 + ... + 18414061.

Almost surely, 2^{20002100222221} is an apocalyptic number.

It is an amenable number.

20002100222221 is a deficient number, since it is larger than the sum of its proper divisors (3779378187699).

20002100222221 is a wasteful number, since it uses less digits than its factorization.

20002100222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120478 (or 1120437 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20002100222221 its reverse (12222200120002), we get a palindrome (32224300342223).

The spelling of 20002100222221 in words is "twenty trillion, two billion, one hundred million, two hundred twenty-two thousand, two hundred twenty-one".