202120122021 has 32 divisors (see below), whose sum is σ = 286628336640. Its totient is φ = 126329382144.

The previous prime is 202120121989. The next prime is 202120122101. The reversal of 202120122021 is 120221021202.

It is not a de Polignac number, because 202120122021 - 2⁵ = 202120121989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120129021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5978461 + ... + 6012173.

It is an arithmetic number, because the mean of its divisors is an integer number (8957135520).

Almost surely, 2^202120122021 is an apocalyptic number.

It is an amenable number.

202120122021 is a deficient number, since it is larger than the sum of its proper divisors (84508214619).

202120122021 is a wasteful number, since it uses less digits than its factorization.

202120122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34825.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 202120122021 its reverse (120221021202), we get a palindrome (322341143223).

The spelling of 202120122021 in words is "two hundred two billion, one hundred twenty million, one hundred twenty-two thousand, twenty-one".