20012122012021 has 4 divisors (see below), whose sum is σ = 20437911842112. Its totient is φ = 19586332181932.

The previous prime is 20012122011979. The next prime is 20012122012031. The reversal of 20012122012021 is 12021022121002.

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 not a de Polignac number, because 20012122012021 - 2²⁹ = 20011585141109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012122011986 and 20012122012004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012122012031) 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, 212894914975 + ... + 212894915068.

It is an arithmetic number, because the mean of its divisors is an integer number (5109477960528).

Almost surely, 2^{20012122012021} is an apocalyptic number.

It is an amenable number.

20012122012021 is a deficient number, since it is larger than the sum of its proper divisors (425789830091).

20012122012021 is an equidigital number, since it uses as much as digits as its factorization.

20012122012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425789830090.

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

Adding to 20012122012021 its reverse (12021022121002), we get a palindrome (32033144133023).

The spelling of 20012122012021 in words is "twenty trillion, twelve billion, one hundred twenty-two million, twelve thousand, twenty-one".