202022020121 has 4 divisors (see below), whose sum is σ = 204022238244. Its totient is φ = 200021802000.

The previous prime is 202022020111. The next prime is 202022020147. The reversal of 202022020121 is 121020220202.

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 183509424400 + 18512595721 = 428380^2 + 136061^2 .

It is a cyclic number.

It is not a de Polignac number, because 202022020121 - 2¹⁴ = 202022003737 is a prime.

It is a super-2 number, since 2×202022020121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202022020096 and 202022020105.

It is not an unprimeable number, because it can be changed into a prime (202022020111) 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, 1000108910 + ... + 1000109111.

It is an arithmetic number, because the mean of its divisors is an integer number (51005559561).

Almost surely, 2^202022020121 is an apocalyptic number.

It is an amenable number.

202022020121 is a deficient number, since it is larger than the sum of its proper divisors (2000218123).

202022020121 is a wasteful number, since it uses less digits than its factorization.

202022020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000218122.

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

Adding to 202022020121 its reverse (121020220202), we get a palindrome (323042240323).

The spelling of 202022020121 in words is "two hundred two billion, twenty-two million, twenty thousand, one hundred twenty-one".