20012223013021 has 4 divisors (see below), whose sum is σ = 20158297633692. Its totient is φ = 19866148392352.

The previous prime is 20012223013007. The next prime is 20012223013109. The reversal of 20012223013021 is 12031032221002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4277823524100 + 15734399488921 = 2068290^2 + 3966661^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012223013021 - 2²⁹ = 20011686142109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20012223013021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012223011021) 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, 73037310130 + ... + 73037310403.

It is an arithmetic number, because the mean of its divisors is an integer number (5039574408423).

Almost surely, 2^{20012223013021} is an apocalyptic number.

It is an amenable number.

20012223013021 is a deficient number, since it is larger than the sum of its proper divisors (146074620671).

20012223013021 is a wasteful number, since it uses less digits than its factorization.

20012223013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146074620670.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20012223013021 its reverse (12031032221002), we get a palindrome (32043255234023).

The spelling of 20012223013021 in words is "twenty trillion, twelve billion, two hundred twenty-three million, thirteen thousand, twenty-one".