202122112021 has 4 divisors (see below), whose sum is σ = 202138195372. Its totient is φ = 202106028672.

The previous prime is 202122111979. The next prime is 202122112033. The reversal of 202122112021 is 120211221202.

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 133506928996 + 68615183025 = 365386^2 + 261945^2 .

It is a cyclic number.

It is not a de Polignac number, because 202122112021 - 2⁹ = 202122111509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202122111986 and 202122112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122112421) 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, 8022810 + ... + 8047963.

It is an arithmetic number, because the mean of its divisors is an integer number (50534548843).

Almost surely, 2^202122112021 is an apocalyptic number.

It is an amenable number.

202122112021 is a deficient number, since it is larger than the sum of its proper divisors (16083351).

202122112021 is a wasteful number, since it uses less digits than its factorization.

202122112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16083350.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 202122112021 its reverse (120211221202), we get a palindrome (322333333223).

The spelling of 202122112021 in words is "two hundred two billion, one hundred twenty-two million, one hundred twelve thousand, twenty-one".