312221012100 has 36 divisors (see below), whose sum is σ = 903359462544. Its totient is φ = 83258936480.

The previous prime is 312221012083. The next prime is 312221012101. The reversal of 312221012100 is 1210122213.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 312221012100.

It is not an unprimeable number, because it can be changed into a prime (312221012101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 520368054 + ... + 520368653.

It is an arithmetic number, because the mean of its divisors is an integer number (25093318404).

Almost surely, 2^312221012100 is an apocalyptic number.

312221012100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

312221012100 is an abundant number, since it is smaller than the sum of its proper divisors (591138450444).

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

312221012100 is a wasteful number, since it uses less digits than its factorization.

312221012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040736724 (or 1040736717 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 312221012100 its reverse (1210122213), we get a palindrome (313431134313).

The spelling of 312221012100 in words is "three hundred twelve billion, two hundred twenty-one million, twelve thousand, one hundred".