3121125420 has 96 divisors (see below), whose sum is σ = 9995198976. Its totient is φ = 712857600.

The previous prime is 3121125391. The next prime is 3121125433. The reversal of 3121125420 is 245211213.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 872235 + ... + 875805.

It is an arithmetic number, because the mean of its divisors is an integer number (104116656).

Almost surely, 2^3121125420 is an apocalyptic number.

3121125420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3121125420 is an abundant number, since it is smaller than the sum of its proper divisors (6874073556).

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

3121125420 is a wasteful number, since it uses less digits than its factorization.

3121125420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5671 (or 5669 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 3121125420 is about 55867.0333917956. The cubic root of 3121125420 is about 1461.4043877111.

Adding to 3121125420 its reverse (245211213), we get a palindrome (3366336633).

The spelling of 3121125420 in words is "three billion, one hundred twenty-one million, one hundred twenty-five thousand, four hundred twenty".