20122021120021 has 4 divisors (see below), whose sum is σ = 21181074863200. Its totient is φ = 19062967376844.

The previous prime is 20122021119961. The next prime is 20122021120031. The reversal of 20122021120021 is 12002112022102.

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 20122021120021 - 2⁹ = 20122021119509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20122021119977 and 20122021120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122021120031) 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, 529526871561 + ... + 529526871598.

It is an arithmetic number, because the mean of its divisors is an integer number (5295268715800).

Almost surely, 2^{20122021120021} is an apocalyptic number.

It is an amenable number.

20122021120021 is a deficient number, since it is larger than the sum of its proper divisors (1059053743179).

20122021120021 is a wasteful number, since it uses less digits than its factorization.

20122021120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059053743178.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20122021120021 its reverse (12002112022102), we get a palindrome (32124133142123).

The spelling of 20122021120021 in words is "twenty trillion, one hundred twenty-two billion, twenty-one million, one hundred twenty thousand, twenty-one".