31610457021 has 16 divisors (see below), whose sum is σ = 49515681600. Its totient is φ = 17684171520.

The previous prime is 31610456989. The next prime is 31610457059. The reversal of 31610457021 is 12075401613.

It is not a de Polignac number, because 31610457021 - 2⁵ = 31610456989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31610457021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31610457071) 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 15 ways as a sum of consecutive naturals, for example, 36841596 + ... + 36842453.

It is an arithmetic number, because the mean of its divisors is an integer number (3094730100).

Almost surely, 2^31610457021 is an apocalyptic number.

It is an amenable number.

31610457021 is a deficient number, since it is larger than the sum of its proper divisors (17905224579).

31610457021 is a wasteful number, since it uses less digits than its factorization.

31610457021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73684076.

The product of its (nonzero) digits is 5040, while the sum is 30.

Adding to 31610457021 its reverse (12075401613), we get a palindrome (43685858634).

The spelling of 31610457021 in words is "thirty-one billion, six hundred ten million, four hundred fifty-seven thousand, twenty-one".