31120000021 has 8 divisors (see below), whose sum is σ = 35119749600. Its totient is φ = 27315360240.

The previous prime is 31120000013. The next prime is 31120000027. The reversal of 31120000021 is 12000002113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31120000021 - 2³ = 31120000013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31119999962 and 31120000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120000027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48777111 + ... + 48777748.

It is an arithmetic number, because the mean of its divisors is an integer number (4389968700).

Almost surely, 2^31120000021 is an apocalyptic number.

It is an amenable number.

31120000021 is a deficient number, since it is larger than the sum of its proper divisors (3999749579).

31120000021 is a wasteful number, since it uses less digits than its factorization.

31120000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97554899.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 31120000021 its reverse (12000002113), we get a palindrome (43120002134).

The spelling of 31120000021 in words is "thirty-one billion, one hundred twenty million, twenty-one", and thus it is an aban number.