31220222 has 16 divisors (see below), whose sum is σ = 51190272. Its totient is φ = 14162520.

The previous prime is 31220219. The next prime is 31220239. The reversal of 31220222 is 22202213.

It is a junction number, because it is equal to n+sod(n) for n = 31220197 and 31220206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13043 + ... + 15249.

It is an arithmetic number, because the mean of its divisors is an integer number (3199392).

Almost surely, 2^31220222 is an apocalyptic number.

31220222 is a deficient number, since it is larger than the sum of its proper divisors (19970050).

31220222 is a wasteful number, since it uses less digits than its factorization.

31220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 31220222 is about 5587.5058836658. The cubic root of 31220222 is about 314.8801828678.

Adding to 31220222 its reverse (22202213), we get a palindrome (53422435).

Subtracting from 31220222 its reverse (22202213), we obtain a square (9018009 = 3003²).

The spelling of 31220222 in words is "thirty-one million, two hundred twenty thousand, two hundred twenty-two".