3121315420 has 12 divisors (see below), whose sum is σ = 6554762424. Its totient is φ = 1248526160.

The previous prime is 3121315403. The next prime is 3121315423. The reversal of 3121315420 is 245131213.

It is a happy number.

It is a super-2 number, since 2×3121315420² = 19485219902259552800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3121315391 and 3121315400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121315423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78032866 + ... + 78032905.

It is an arithmetic number, because the mean of its divisors is an integer number (546230202).

Almost surely, 2^3121315420 is an apocalyptic number.

It is an amenable number.

3121315420 is an abundant number, since it is smaller than the sum of its proper divisors (3433447004).

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

3121315420 is a wasteful number, since it uses less digits than its factorization.

3121315420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156065780 (or 156065778 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 3121315420 is about 55868.7338320818. The cubic root of 3121315420 is about 1461.4340416726.

Adding to 3121315420 its reverse (245131213), we get a palindrome (3366446633).

The spelling of 3121315420 in words is "three billion, one hundred twenty-one million, three hundred fifteen thousand, four hundred twenty".