31100311212 has 24 divisors (see below), whose sum is σ = 75722497536. Its totient is φ = 9916041168.

The previous prime is 31100311201. The next prime is 31100311213. The reversal of 31100311212 is 21211300113.

It is a happy number.

It is a super-3 number, since 3×31100311212³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31100311191 and 31100311200.

It is not an unprimeable number, because it can be changed into a prime (31100311213) 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, 56340868 + ... + 56341419.

It is an arithmetic number, because the mean of its divisors is an integer number (3155104064).

Almost surely, 2^31100311212 is an apocalyptic number.

It is an amenable number.

31100311212 is an abundant number, since it is smaller than the sum of its proper divisors (44622186324).

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

31100311212 is a wasteful number, since it uses less digits than its factorization.

31100311212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112682317 (or 112682315 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31100311212 its reverse (21211300113), we get a palindrome (52311611325).

The spelling of 31100311212 in words is "thirty-one billion, one hundred million, three hundred eleven thousand, two hundred twelve".