31203112212 has 18 divisors (see below), whose sum is σ = 78874533738. Its totient is φ = 10401037392.

The previous prime is 31203112183. The next prime is 31203112229. The reversal of 31203112212 is 21221130213.

It can be written as a sum of positive squares in only one way, i.e., 22908638736 + 8294473476 = 151356^2 + 91074^2 .

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 polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 433376523 + ... + 433376594.

It is an arithmetic number, because the mean of its divisors is an integer number (4381918541).

Almost surely, 2^31203112212 is an apocalyptic number.

It is an amenable number.

31203112212 is an abundant number, since it is smaller than the sum of its proper divisors (47671421526).

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

31203112212 is a wasteful number, since it uses less digits than its factorization.

31203112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866753127 (or 866753122 counting only the distinct ones).

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

Adding to 31203112212 its reverse (21221130213), we get a palindrome (52424242425).

The spelling of 31203112212 in words is "thirty-one billion, two hundred three million, one hundred twelve thousand, two hundred twelve".