31222131021 has 16 divisors (see below), whose sum is σ = 46679371200. Its totient is φ = 20623791024.

The previous prime is 31222130981. The next prime is 31222131037. The reversal of 31222131021 is 12013122213.

31222131021 is a `hidden beast` number, since 312 + 2 + 21 + 310 + 21 = 666.

It is not a de Polignac number, because 31222131021 - 2⁶ = 31222130957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31222130985 and 31222131003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222131041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5301531 + ... + 5307416.

It is an arithmetic number, because the mean of its divisors is an integer number (2917460700).

Almost surely, 2^31222131021 is an apocalyptic number.

It is an amenable number.

31222131021 is a deficient number, since it is larger than the sum of its proper divisors (15457240179).

31222131021 is a wasteful number, since it uses less digits than its factorization.

31222131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10609065 (or 10609059 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31222131021 its reverse (12013122213), we get a palindrome (43235253234).

The spelling of 31222131021 in words is "thirty-one billion, two hundred twenty-two million, one hundred thirty-one thousand, twenty-one".