3131421220 has 24 divisors (see below), whose sum is σ = 6627769344. Its totient is φ = 1242704736.

The previous prime is 3131421151. The next prime is 3131421323. The reversal of 3131421220 is 221241313.

It is a happy 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, 613882 + ... + 618961.

It is an arithmetic number, because the mean of its divisors is an integer number (276157056).

Almost surely, 2^3131421220 is an apocalyptic number.

It is an amenable number.

3131421220 is an abundant number, since it is smaller than the sum of its proper divisors (3496348124).

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

3131421220 is a wasteful number, since it uses less digits than its factorization.

3131421220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232979 (or 1232977 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 3131421220 is about 55959.1031021763. The cubic root of 3131421220 is about 1463.0095579468.

Adding to 3131421220 its reverse (221241313), we get a palindrome (3352662533).

The spelling of 3131421220 in words is "three billion, one hundred thirty-one million, four hundred twenty-one thousand, two hundred twenty".