31220012 has 12 divisors (see below), whose sum is σ = 54678960. Its totient is φ = 15597456.

The previous prime is 31220011. The next prime is 31220023. The reversal of 31220012 is 21002213.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31219975 and 31220002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4553 + ... + 9119.

It is an arithmetic number, because the mean of its divisors is an integer number (4556580).

Almost surely, 2^31220012 is an apocalyptic number.

It is an amenable number.

31220012 is a deficient number, since it is larger than the sum of its proper divisors (23458948).

31220012 is a wasteful number, since it uses less digits than its factorization.

31220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6280 (or 6278 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 31220012 is about 5587.4870917077. The cubic root of 31220012 is about 314.8794768618.

Adding to 31220012 its reverse (21002213), we get a palindrome (52222225).

The spelling of 31220012 in words is "thirty-one million, two hundred twenty thousand, twelve".