202020020120021 has 4 divisors (see below), whose sum is σ = 202020192847200. Its totient is φ = 202019847392844.

The previous prime is 202020020119961. The next prime is 202020020120053. The reversal of 202020020120021 is 120021020020202.

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 202020020120021 - 2¹⁰ = 202020020118997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202020020119978 and 202020020120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202020020120521) 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, 84597161 + ... + 86952398.

It is an arithmetic number, because the mean of its divisors is an integer number (50505048211800).

Almost surely, 2^{202020020120021} is an apocalyptic number.

It is an amenable number.

202020020120021 is a deficient number, since it is larger than the sum of its proper divisors (172727179).

202020020120021 is a wasteful number, since it uses less digits than its factorization.

202020020120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172727178.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 202020020120021 its reverse (120021020020202), we get a palindrome (322041040140223).

The spelling of 202020020120021 in words is "two hundred two trillion, twenty billion, twenty million, one hundred twenty thousand, twenty-one".