31514434021 has 4 divisors (see below), whose sum is σ = 36016496032. Its totient is φ = 27012372012.

The previous prime is 31514433949. The next prime is 31514434027. The reversal of 31514434021 is 12043441513.

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: 12043441513 = 13669 ⋅881077.

It is a cyclic number.

It is not a de Polignac number, because 31514434021 - 2²⁵ = 31480879589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31514434027) 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, 2251030995 + ... + 2251031008.

It is an arithmetic number, because the mean of its divisors is an integer number (9004124008).

Almost surely, 2^31514434021 is an apocalyptic number.

It is an amenable number.

31514434021 is a deficient number, since it is larger than the sum of its proper divisors (4502062011).

31514434021 is an equidigital number, since it uses as much as digits as its factorization.

31514434021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4502062010.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 31514434021 its reverse (12043441513), we get a palindrome (43557875534).

The spelling of 31514434021 in words is "thirty-one billion, five hundred fourteen million, four hundred thirty-four thousand, twenty-one".