31103212 has 24 divisors (see below), whose sum is σ = 62451200. Its totient is φ = 13277520.

The previous prime is 31103203. The next prime is 31103213. The reversal of 31103212 is 21230113.

It is a junction number, because it is equal to n+sod(n) for n = 31103192 and 31103201.

It is not an unprimeable number, because it can be changed into a prime (31103213) 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, 5539 + ... + 9637.

Almost surely, 2^31103212 is an apocalyptic number.

It is an amenable number.

31103212 is an abundant number, since it is smaller than the sum of its proper divisors (31347988).

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

31103212 is a wasteful number, since it uses less digits than its factorization.

31103212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381 (or 4379 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31103212 is about 5577.0253720061. The cubic root of 31103212 is about 314.4863114902.

Adding to 31103212 its reverse (21230113), we get a palindrome (52333325).

The spelling of 31103212 in words is "thirty-one million, one hundred three thousand, two hundred twelve".