31123023212 has 24 divisors (see below), whose sum is σ = 55499640000. Its totient is φ = 15267042576.

The previous prime is 31123023203. The next prime is 31123023247. The reversal of 31123023212 is 21232032113.

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, 14378 + ... + 249905.

It is an arithmetic number, because the mean of its divisors is an integer number (2312485000).

Almost surely, 2^31123023212 is an apocalyptic number.

It is an amenable number.

31123023212 is a deficient number, since it is larger than the sum of its proper divisors (24376616788).

31123023212 is a wasteful number, since it uses less digits than its factorization.

31123023212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264845 (or 264843 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31123023212 its reverse (21232032113), we get a palindrome (52355055325).

The spelling of 31123023212 in words is "thirty-one billion, one hundred twenty-three million, twenty-three thousand, two hundred twelve".