31023121212 has 18 divisors (see below), whose sum is σ = 78419556488. Its totient is φ = 10341040392.

The previous prime is 31023121201. The next prime is 31023121237. The reversal of 31023121212 is 21212132013.

31023121212 is a `hidden beast` number, since 310 + 23 + 121 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 430876648 + ... + 430876719.

Almost surely, 2^31023121212 is an apocalyptic number.

It is an amenable number.

31023121212 is an abundant number, since it is smaller than the sum of its proper divisors (47396435276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31023121212 is a wasteful number, since it uses less digits than its factorization.

31023121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861753377 (or 861753372 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31023121212 its reverse (21212132013), we get a palindrome (52235253225).

The spelling of 31023121212 in words is "thirty-one billion, twenty-three million, one hundred twenty-one thousand, two hundred twelve".