202131222221 has 4 divisors (see below), whose sum is σ = 205557175200. Its totient is φ = 198705269244.

The previous prime is 202131222179. The next prime is 202131222301. The reversal of 202131222221 is 122222131202.

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 a cyclic number.

It is not a de Polignac number, because 202131222221 - 2³⁰ = 201057480397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202131222193 and 202131222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202130222221) 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, 1712976401 + ... + 1712976518.

It is an arithmetic number, because the mean of its divisors is an integer number (51389293800).

Almost surely, 2^202131222221 is an apocalyptic number.

It is an amenable number.

202131222221 is a deficient number, since it is larger than the sum of its proper divisors (3425952979).

202131222221 is an equidigital number, since it uses as much as digits as its factorization.

202131222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3425952978.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 202131222221 its reverse (122222131202), we get a palindrome (324353353423).

The spelling of 202131222221 in words is "two hundred two billion, one hundred thirty-one million, two hundred twenty-two thousand, two hundred twenty-one".