31312022222221 has 16 divisors (see below), whose sum is σ = 34113316406400. Its totient is φ = 28568055417408.

The previous prime is 31312022222209. The next prime is 31312022222233. The reversal of 31312022222221 is 12222222021313.

It is an interprime number because it is at equal distance from previous prime (31312022222209) and next prime (31312022222233).

It is not a de Polignac number, because 31312022222221 - 2⁷ = 31312022222093 is a prime.

It is a super-2 number, since 2×31312022222221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312022222291) 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, 25027666 + ... + 26248963.

It is an arithmetic number, because the mean of its divisors is an integer number (2132082275400).

Almost surely, 2^{31312022222221} is an apocalyptic number.

It is an amenable number.

31312022222221 is a deficient number, since it is larger than the sum of its proper divisors (2801294184179).

31312022222221 is a wasteful number, since it uses less digits than its factorization.

31312022222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51277188.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 31312022222221 its reverse (12222222021313), we get a palindrome (43534244243534).

The spelling of 31312022222221 in words is "thirty-one trillion, three hundred twelve billion, twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".