31101211212 has 48 divisors (see below), whose sum is σ = 74552862720. Its totient is φ = 10083897792.

The previous prime is 31101211139. The next prime is 31101211223. The reversal of 31101211212 is 21211210113.

It is a junction number, because it is equal to n+sod(n) for n = 31101211191 and 31101211200.

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 15 ways as a sum of consecutive naturals, for example, 1882773 + ... + 1899219.

It is an arithmetic number, because the mean of its divisors is an integer number (1553184640).

Almost surely, 2^31101211212 is an apocalyptic number.

It is an amenable number.

31101211212 is an abundant number, since it is smaller than the sum of its proper divisors (43451651508).

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

31101211212 is a wasteful number, since it uses less digits than its factorization.

31101211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20750 (or 20748 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 31101211212 its reverse (21211210113), we get a palindrome (52312421325).

The spelling of 31101211212 in words is "thirty-one billion, one hundred one million, two hundred eleven thousand, two hundred twelve".