31222202021 has 4 divisors (see below), whose sum is σ = 31223528172. Its totient is φ = 31220875872.

The previous prime is 31222201999. The next prime is 31222202027. The reversal of 31222202021 is 12020222213.

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 5149641121 + 26072560900 = 71761^2 + 161470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31222202021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222202027) 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, 627110 + ... + 675063.

It is an arithmetic number, because the mean of its divisors is an integer number (7805882043).

Almost surely, 2^31222202021 is an apocalyptic number.

It is an amenable number.

31222202021 is a deficient number, since it is larger than the sum of its proper divisors (1326151).

31222202021 is a wasteful number, since it uses less digits than its factorization.

31222202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326150.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 31222202021 its reverse (12020222213), we get a palindrome (43242424234).

The spelling of 31222202021 in words is "thirty-one billion, two hundred twenty-two million, two hundred two thousand, twenty-one".