202122123021 has 24 divisors (see below), whose sum is σ = 359328220160. Its totient is φ = 106613866656.

The previous prime is 202122123017. The next prime is 202122123023. The reversal of 202122123021 is 120321221202.

It is not a de Polignac number, because 202122123021 - 2² = 202122123017 is a prime.

It is a super-2 number, since 2×202122123021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 202122122985 and 202122123003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122123023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123394861 + ... + 123396498.

Almost surely, 2^202122123021 is an apocalyptic number.

202122123021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202122123021 is a deficient number, since it is larger than the sum of its proper divisors (157206097139).

202122123021 is a wasteful number, since it uses less digits than its factorization.

202122123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246791385 (or 246791382 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 202122123021 its reverse (120321221202), we get a palindrome (322443344223).

The spelling of 202122123021 in words is "two hundred two billion, one hundred twenty-two million, one hundred twenty-three thousand, twenty-one".