31121010002 has 4 divisors (see below), whose sum is σ = 46681515006. Its totient is φ = 15560505000.

The previous prime is 31121009987. The next prime is 31121010031. The reversal of 31121010002 is 20001012113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 27499257241 + 3621752761 = 165829^2 + 60181^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780252499 + ... + 7780252502.

Almost surely, 2^31121010002 is an apocalyptic number.

31121010002 is a deficient number, since it is larger than the sum of its proper divisors (15560505004).

31121010002 is a wasteful number, since it uses less digits than its factorization.

31121010002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15560505003.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 31121010002 its reverse (20001012113), we get a palindrome (51122022115).

The spelling of 31121010002 in words is "thirty-one billion, one hundred twenty-one million, ten thousand, two".