312123113220 has 96 divisors (see below), whose sum is σ = 912778046208. Its totient is φ = 79541051392.

The previous prime is 312123113209. The next prime is 312123113231. The reversal of 312123113220 is 22311321213.

It is an interprime number because it is at equal distance from previous prime (312123113209) and next prime (312123113231).

It is a super-2 number, since 2×312123113220² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1410772 + ... + 1616948.

It is an arithmetic number, because the mean of its divisors is an integer number (9508104648).

Almost surely, 2^312123113220 is an apocalyptic number.

312123113220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 312123113220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (456389023104).

312123113220 is an abundant number, since it is smaller than the sum of its proper divisors (600654932988).

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

312123113220 is a wasteful number, since it uses less digits than its factorization.

312123113220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207309 (or 207307 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 312123113220 its reverse (22311321213), we get a palindrome (334434434433).

The spelling of 312123113220 in words is "three hundred twelve billion, one hundred twenty-three million, one hundred thirteen thousand, two hundred twenty".