3121312220 has 24 divisors (see below), whose sum is σ = 7058968224. Its totient is φ = 1152484416.

The previous prime is 3121312213. The next prime is 3121312279. The reversal of 3121312220 is 222131213.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6002264 + ... + 6002783.

It is an arithmetic number, because the mean of its divisors is an integer number (294123676).

Almost surely, 2^3121312220 is an apocalyptic number.

It is an amenable number.

3121312220 is an abundant number, since it is smaller than the sum of its proper divisors (3937656004).

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

3121312220 is a wasteful number, since it uses less digits than its factorization.

3121312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12005069 (or 12005067 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 3121312220 is about 55868.7051935160. The cubic root of 3121312220 is about 1461.4335422475.

Adding to 3121312220 its reverse (222131213), we get a palindrome (3343443433).

The spelling of 3121312220 in words is "three billion, one hundred twenty-one million, three hundred twelve thousand, two hundred twenty".