31424310021 has 16 divisors (see below), whose sum is σ = 45153654336. Its totient is φ = 19324507776.

The previous prime is 31424310019. The next prime is 31424310031. The reversal of 31424310021 is 12001342413.

It is not a de Polignac number, because 31424310021 - 2¹ = 31424310019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31424310021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31424310011) 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, 225255 + ... + 337028.

It is an arithmetic number, because the mean of its divisors is an integer number (2822103396).

Almost surely, 2^31424310021 is an apocalyptic number.

It is an amenable number.

31424310021 is a deficient number, since it is larger than the sum of its proper divisors (13729344315).

31424310021 is a wasteful number, since it uses less digits than its factorization.

31424310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563732.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31424310021 its reverse (12001342413), we get a palindrome (43425652434).

The spelling of 31424310021 in words is "thirty-one billion, four hundred twenty-four million, three hundred ten thousand, twenty-one".