312121011222 has 24 divisors (see below), whose sum is σ = 694539548976. Its totient is φ = 101228435856.

The previous prime is 312121011221. The next prime is 312121011271. The reversal of 312121011222 is 222110121213.

312121011222 is a `hidden beast` number, since 312 + 121 + 0 + 11 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 312121011195 and 312121011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312121011221) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 234324418 + ... + 234325749.

It is an arithmetic number, because the mean of its divisors is an integer number (28939147874).

Almost surely, 2^312121011222 is an apocalyptic number.

312121011222 is an abundant number, since it is smaller than the sum of its proper divisors (382418537754).

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

312121011222 is a wasteful number, since it uses less digits than its factorization.

312121011222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468650212 (or 468650209 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 312121011222 its reverse (222110121213), we get a palindrome (534231132435).

The spelling of 312121011222 in words is "three hundred twelve billion, one hundred twenty-one million, eleven thousand, two hundred twenty-two".