312121222 has 16 divisors (see below), whose sum is σ = 536175360. Its totient is φ = 133488648.

The previous prime is 312121217. The next prime is 312121273. The reversal of 312121222 is 222121213.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 312121196 and 312121205.

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, 16072 + ... + 29707.

It is an arithmetic number, because the mean of its divisors is an integer number (33510960).

Almost surely, 2^312121222 is an apocalyptic number.

312121222 is a deficient number, since it is larger than the sum of its proper divisors (224054138).

312121222 is a wasteful number, since it uses less digits than its factorization.

312121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46275.

The product of its digits is 96, while the sum is 16.

The square root of 312121222 is about 17666.9528215819. The cubic root of 312121222 is about 678.3301168517.

Adding to 312121222 its reverse (222121213), we get a palindrome (534242435).

Subtracting from 312121222 its reverse (222121213), we obtain a palindrome (90000009).

The spelling of 312121222 in words is "three hundred twelve million, one hundred twenty-one thousand, two hundred twenty-two".