20102122021 has 4 divisors (see below), whose sum is σ = 20112160032. Its totient is φ = 20092084012.

The previous prime is 20102121997. The next prime is 20102122031. The reversal of 20102122021 is 12022120102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20102122021 - 2²⁹ = 19565251109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102121992 and 20102122010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102122031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5016001 + ... + 5020006.

It is an arithmetic number, because the mean of its divisors is an integer number (5028040008).

Almost surely, 2^20102122021 is an apocalyptic number.

It is an amenable number.

20102122021 is a deficient number, since it is larger than the sum of its proper divisors (10038011).

20102122021 is a wasteful number, since it uses less digits than its factorization.

20102122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10038010.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20102122021 its reverse (12022120102), we get a palindrome (32124242123).

The spelling of 20102122021 in words is "twenty billion, one hundred two million, one hundred twenty-two thousand, twenty-one".