31123121102 has 16 divisors (see below), whose sum is σ = 48786769152. Its totient is φ = 14876264760.

The previous prime is 31123121083. The next prime is 31123121123. The reversal of 31123121102 is 20112132113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3845924 + ... + 3854007.

It is an arithmetic number, because the mean of its divisors is an integer number (3049173072).

Almost surely, 2^31123121102 is an apocalyptic number.

31123121102 is a deficient number, since it is larger than the sum of its proper divisors (17663648050).

31123121102 is a wasteful number, since it uses less digits than its factorization.

31123121102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7700023.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31123121102 its reverse (20112132113), we get a palindrome (51235253215).

The spelling of 31123121102 in words is "thirty-one billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred two".