202122012021 has 16 divisors (see below), whose sum is σ = 271306487808. Its totient is φ = 133842942000.

The previous prime is 202122012013. The next prime is 202122012049. The reversal of 202122012021 is 120210221202.

It is not a de Polignac number, because 202122012021 - 2³ = 202122012013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122012721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9015736 + ... + 9038126.

It is an arithmetic number, because the mean of its divisors is an integer number (16956655488).

Almost surely, 2^202122012021 is an apocalyptic number.

It is an amenable number.

202122012021 is a deficient number, since it is larger than the sum of its proper divisors (69184475787).

202122012021 is a wasteful number, since it uses less digits than its factorization.

202122012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42472.

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

Adding to 202122012021 its reverse (120210221202), we get a palindrome (322332233223).

The spelling of 202122012021 in words is "two hundred two billion, one hundred twenty-two million, twelve thousand, twenty-one".