20002220010021 has 4 divisors (see below), whose sum is σ = 26669626680032. Its totient is φ = 13334813340012.

The previous prime is 20002220009999. The next prime is 20002220010023. The reversal of 20002220010021 is 12001002220002.

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 not a de Polignac number, because 20002220010021 - 2²² = 20002215815717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002220009979 and 20002220010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002220010023) 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, 3333703335001 + ... + 3333703335006.

It is an arithmetic number, because the mean of its divisors is an integer number (6667406670008).

Almost surely, 2^{20002220010021} is an apocalyptic number.

It is an amenable number.

20002220010021 is a deficient number, since it is larger than the sum of its proper divisors (6667406670011).

20002220010021 is an equidigital number, since it uses as much as digits as its factorization.

20002220010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667406670010.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20002220010021 its reverse (12001002220002), we get a palindrome (32003222230023).

The spelling of 20002220010021 in words is "twenty trillion, two billion, two hundred twenty million, ten thousand, twenty-one".