312201321222 has 96 divisors (see below), whose sum is σ = 737895916800. Its totient is φ = 86260818240.

The previous prime is 312201321193. The next prime is 312201321277. The reversal of 312201321222 is 222123102213.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 107321104 + ... + 107324012.

It is an arithmetic number, because the mean of its divisors is an integer number (7686415800).

Almost surely, 2^312201321222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 312201321222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368947958400).

312201321222 is an abundant number, since it is smaller than the sum of its proper divisors (425694595578).

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

312201321222 is a wasteful number, since it uses less digits than its factorization.

312201321222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5642 (or 5611 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 312201321222 its reverse (222123102213), we get a palindrome (534324423435).

The spelling of 312201321222 in words is "three hundred twelve billion, two hundred one million, three hundred twenty-one thousand, two hundred twenty-two".