20000022121021 has 4 divisors (see below), whose sum is σ = 20032971087232. Its totient is φ = 19967073154812.

The previous prime is 20000022120997. The next prime is 20000022121031. The reversal of 20000022121021 is 12012122000002.

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 20000022121021 - 2⁵ = 20000022120989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000022120992 and 20000022121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000022121031) 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, 16474482195 + ... + 16474483408.

It is an arithmetic number, because the mean of its divisors is an integer number (5008242771808).

Almost surely, 2^{20000022121021} is an apocalyptic number.

It is an amenable number.

20000022121021 is a deficient number, since it is larger than the sum of its proper divisors (32948966211).

20000022121021 is an equidigital number, since it uses as much as digits as its factorization.

20000022121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32948966210.

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

Adding to 20000022121021 its reverse (12012122000002), we get a palindrome (32012144121023).

The spelling of 20000022121021 in words is "twenty trillion, twenty-two million, one hundred twenty-one thousand, twenty-one".