3121123220 has 24 divisors (see below), whose sum is σ = 6555785544. Its totient is φ = 1248177536.

The previous prime is 3121123189. The next prime is 3121123303. The reversal of 3121123220 is 223211213.

It can be written as a sum of positive squares in 4 ways, for example, as 1349386756 + 1771736464 = 36734^2 + 42092^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95294 + ... + 123786.

It is an arithmetic number, because the mean of its divisors is an integer number (273157731).

Almost surely, 2^3121123220 is an apocalyptic number.

It is an amenable number.

3121123220 is an abundant number, since it is smaller than the sum of its proper divisors (3434662324).

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

3121123220 is a wasteful number, since it uses less digits than its factorization.

3121123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33979 (or 33977 counting only the distinct ones).

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

The square root of 3121123220 is about 55867.0137021839. The cubic root of 3121123220 is about 1461.4040443424.

Adding to 3121123220 its reverse (223211213), we get a palindrome (3344334433).

The spelling of 3121123220 in words is "three billion, one hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty".