31213121123 has 8 divisors (see below), whose sum is σ = 31394397216. Its totient is φ = 31031942400.

The previous prime is 31213121113. The next prime is 31213121161. The reversal of 31213121123 is 32112131213.

It is a happy number.

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 31213121123 - 2⁸ = 31213120867 is a prime.

It is a super-2 number, since 2×31213121123² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31213121095 and 31213121104.

It is not an unprimeable number, because it can be changed into a prime (31213121113) 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, 676883 + ... + 721523.

It is an arithmetic number, because the mean of its divisors is an integer number (3924299652).

Almost surely, 2^31213121123 is an apocalyptic number.

31213121123 is a deficient number, since it is larger than the sum of its proper divisors (181276093).

31213121123 is a wasteful number, since it uses less digits than its factorization.

31213121123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48685.

The product of its digits is 216, while the sum is 20.

Adding to 31213121123 its reverse (32112131213), we get a palindrome (63325252336).

The spelling of 31213121123 in words is "thirty-one billion, two hundred thirteen million, one hundred twenty-one thousand, one hundred twenty-three".