31122221222 has 4 divisors (see below), whose sum is σ = 46683331836. Its totient is φ = 15561110610.

The previous prime is 31122221201. The next prime is 31122221257. The reversal of 31122221222 is 22212222113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22212222113 = 122207 ⋅181759.

It is a super-2 number, since 2×31122221222² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31122221194 and 31122221203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780555304 + ... + 7780555307.

It is an arithmetic number, because the mean of its divisors is an integer number (11670832959).

Almost surely, 2^31122221222 is an apocalyptic number.

31122221222 is a deficient number, since it is larger than the sum of its proper divisors (15561110614).

31122221222 is a wasteful number, since it uses less digits than its factorization.

31122221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15561110613.

The product of its digits is 384, while the sum is 20.

Adding to 31122221222 its reverse (22212222113), we get a palindrome (53334443335).

The spelling of 31122221222 in words is "thirty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-two".