31347750421 has 8 divisors (see below), whose sum is σ = 33794553240. Its totient is φ = 28906010112.

The previous prime is 31347750391. The next prime is 31347750443. The reversal of 31347750421 is 12405774313.

It can be written as a sum of positive squares in 4 ways, for example, as 927507025 + 30420243396 = 30455^2 + 174414^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31347750421 - 2⁷ = 31347750293 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 (31347700421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1252756 + ... + 1277533.

It is an arithmetic number, because the mean of its divisors is an integer number (4224319155).

Almost surely, 2^31347750421 is an apocalyptic number.

It is an amenable number.

31347750421 is a deficient number, since it is larger than the sum of its proper divisors (2446802819).

31347750421 is a wasteful number, since it uses less digits than its factorization.

31347750421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531255.

The product of its (nonzero) digits is 70560, while the sum is 37.

The spelling of 31347750421 in words is "thirty-one billion, three hundred forty-seven million, seven hundred fifty thousand, four hundred twenty-one".