31244024021 has 16 divisors (see below), whose sum is σ = 37293348864. Its totient is φ = 25593259824.

The previous prime is 31244024003. The next prime is 31244024041. The reversal of 31244024021 is 12042044213.

It is a cyclic number.

It is not a de Polignac number, because 31244024021 - 2⁶ = 31244023957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31244024041) 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, 94400 + ... + 267206.

It is an arithmetic number, because the mean of its divisors is an integer number (2330834304).

Almost surely, 2^31244024021 is an apocalyptic number.

It is an amenable number.

31244024021 is a deficient number, since it is larger than the sum of its proper divisors (6049324843).

31244024021 is a wasteful number, since it uses less digits than its factorization.

31244024021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173960.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 31244024021 its reverse (12042044213), we get a palindrome (43286068234).

The spelling of 31244024021 in words is "thirty-one billion, two hundred forty-four million, twenty-four thousand, twenty-one".