31456523021 has 16 divisors (see below), whose sum is σ = 40130585088. Its totient is φ = 23941537200.

The previous prime is 31456523017. The next prime is 31456523051. The reversal of 31456523021 is 12032565413.

It is a happy number.

It is not a de Polignac number, because 31456523021 - 2² = 31456523017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31456523011) 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, 4746995 + ... + 4753616.

It is an arithmetic number, because the mean of its divisors is an integer number (2508161568).

Almost surely, 2^31456523021 is an apocalyptic number.

It is an amenable number.

31456523021 is a deficient number, since it is larger than the sum of its proper divisors (8674062067).

31456523021 is a wasteful number, since it uses less digits than its factorization.

31456523021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9500672.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 31456523021 in words is "thirty-one billion, four hundred fifty-six million, five hundred twenty-three thousand, twenty-one".