3121322220 has 72 divisors (see below), whose sum is σ = 9723923664. Its totient is φ = 809854848.

The previous prime is 3121322201. The next prime is 3121322221. The reversal of 3121322220 is 222231213.

3121322220 is a `hidden beast` number, since 3 + 121 + 322 + 220 = 666.

3121322220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 3121322193 and 3121322202.

It is not an unprimeable number, because it can be changed into a prime (3121322221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 227674 + ... + 240993.

Almost surely, 2^3121322220 is an apocalyptic number.

3121322220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3121322220 is an abundant number, since it is smaller than the sum of its proper divisors (6602601444).

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

3121322220 is a wasteful number, since it uses less digits than its factorization.

3121322220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468719 (or 468714 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 3121322220 is about 55868.7946889854. The cubic root of 3121322220 is about 1461.4351029500.

Adding to 3121322220 its reverse (222231213), we get a palindrome (3343553433).

The spelling of 3121322220 in words is "three billion, one hundred twenty-one million, three hundred twenty-two thousand, two hundred twenty".