20200102001221 has 4 divisors (see below), whose sum is σ = 20215920406572. Its totient is φ = 20184283595872.

The previous prime is 20200102001089. The next prime is 20200102001239. The reversal of 20200102001221 is 12210020100202.

It is a happy number.

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 15069038916996 + 5131063084225 = 3881886^2 + 2265185^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200102001221 - 2²³ = 20200093612613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20200102001291) 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, 7909200760 + ... + 7909203313.

It is an arithmetic number, because the mean of its divisors is an integer number (5053980101643).

Almost surely, 2^{20200102001221} is an apocalyptic number.

It is an amenable number.

20200102001221 is a deficient number, since it is larger than the sum of its proper divisors (15818405351).

20200102001221 is a wasteful number, since it uses less digits than its factorization.

20200102001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15818405350.

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

Adding to 20200102001221 its reverse (12210020100202), we get a palindrome (32410122101423).

The spelling of 20200102001221 in words is "twenty trillion, two hundred billion, one hundred two million, one thousand, two hundred twenty-one".