31222120 has 16 divisors (see below), whose sum is σ = 70249860. Its totient is φ = 12488832.

The previous prime is 31222099. The next prime is 31222123. The reversal of 31222120 is 2122213.

It can be written as a sum of positive squares in 2 ways, for example, as 27604516 + 3617604 = 5254^2 + 1902^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31222120.

It is not an unprimeable number, because it can be changed into a prime (31222123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390237 + ... + 390316.

Almost surely, 2^31222120 is an apocalyptic number.

It is an amenable number.

31222120 is an abundant number, since it is smaller than the sum of its proper divisors (39027740).

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

31222120 is a wasteful number, since it uses less digits than its factorization.

31222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780564 (or 780560 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 31222120 is about 5587.6757243061. The cubic root of 31222120 is about 314.8865636731.

Adding to 31222120 its reverse (2122213), we get a palindrome (33344333).

The spelling of 31222120 in words is "thirty-one million, two hundred twenty-two thousand, one hundred twenty".