202122021 has 4 divisors (see below), whose sum is σ = 269496032. Its totient is φ = 134748012.

The previous prime is 202122013. The next prime is 202122029. The reversal of 202122021 is 120221202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (202122013) and next prime (202122029).

It is not a de Polignac number, because 202122021 - 2³ = 202122013 is a prime.

It is a super-2 number, since 2×202122021² = 81706622746248882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202121988 and 202122006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122029) 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, 33687001 + ... + 33687006.

It is an arithmetic number, because the mean of its divisors is an integer number (67374008).

Almost surely, 2^202122021 is an apocalyptic number.

It is an amenable number.

202122021 is a deficient number, since it is larger than the sum of its proper divisors (67374011).

202122021 is an equidigital number, since it uses as much as digits as its factorization.

202122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67374010.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 202122021 is about 14216.9624392836. The cubic root of 202122021 is about 586.8645512651.

Adding to 202122021 its reverse (120221202), we get a palindrome (322343223).

It can be divided in two parts, 2021 and 22021, that added together give a palindrome (24042).

The spelling of 202122021 in words is "two hundred two million, one hundred twenty-two thousand, twenty-one".