20102211021 has 16 divisors (see below), whose sum is σ = 26918049600. Its totient is φ = 13343981568.

The previous prime is 20102211013. The next prime is 20102211079. The reversal of 20102211021 is 12011220102.

It is not a de Polignac number, because 20102211021 - 2³ = 20102211013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20102210988 and 20102211006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102211001) 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, 1629645 + ... + 1641933.

It is an arithmetic number, because the mean of its divisors is an integer number (1682378100).

Almost surely, 2^20102211021 is an apocalyptic number.

It is an amenable number.

20102211021 is a deficient number, since it is larger than the sum of its proper divisors (6815838579).

20102211021 is a wasteful number, since it uses less digits than its factorization.

20102211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14588.

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

Adding to 20102211021 its reverse (12011220102), we get a palindrome (32113431123).

The spelling of 20102211021 in words is "twenty billion, one hundred two million, two hundred eleven thousand, twenty-one".