31797703221 has 4 divisors (see below), whose sum is σ = 42396937632. Its totient is φ = 21198468812.

The previous prime is 31797703207. The next prime is 31797703237. The reversal of 31797703221 is 12230779713.

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 31797703221 - 2²⁵ = 31764148789 is a prime.

It is a super-2 number, since 2×31797703221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31797703621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5299617201 + ... + 5299617206.

It is an arithmetic number, because the mean of its divisors is an integer number (10599234408).

Almost surely, 2^31797703221 is an apocalyptic number.

It is an amenable number.

31797703221 is a deficient number, since it is larger than the sum of its proper divisors (10599234411).

31797703221 is a wasteful number, since it uses less digits than its factorization.

31797703221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10599234410.

The product of its (nonzero) digits is 111132, while the sum is 42.

The spelling of 31797703221 in words is "thirty-one billion, seven hundred ninety-seven million, seven hundred three thousand, two hundred twenty-one".