31454024021 has 4 divisors (see below), whose sum is σ = 35947456032. Its totient is φ = 26960592012.

The previous prime is 31454024011. The next prime is 31454024023. The reversal of 31454024021 is 12042045413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12042045413 = 827 ⋅14561119.

It is a cyclic number.

It is not a de Polignac number, because 31454024021 - 2²² = 31449829717 is a prime.

It is a super-2 number, since 2×31454024021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31454024023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2246715995 + ... + 2246716008.

It is an arithmetic number, because the mean of its divisors is an integer number (8986864008).

Almost surely, 2^31454024021 is an apocalyptic number.

It is an amenable number.

31454024021 is a deficient number, since it is larger than the sum of its proper divisors (4493432011).

31454024021 is an equidigital number, since it uses as much as digits as its factorization.

31454024021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4493432010.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 31454024021 its reverse (12042045413), we get a palindrome (43496069434).

The spelling of 31454024021 in words is "thirty-one billion, four hundred fifty-four million, twenty-four thousand, twenty-one".