3121421420 has 48 divisors (see below), whose sum is σ = 7067360160. Its totient is φ = 1151195136.

The previous prime is 3121421411. The next prime is 3121421437. The reversal of 3121421420 is 241241213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 3121421392 and 3121421401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235079 + ... + 248001.

It is an arithmetic number, because the mean of its divisors is an integer number (147236670).

Almost surely, 2^3121421420 is an apocalyptic number.

It is an amenable number.

3121421420 is an abundant number, since it is smaller than the sum of its proper divisors (3945938740).

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

3121421420 is a wasteful number, since it uses less digits than its factorization.

3121421420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13874 (or 13872 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 3121421420 is about 55869.6824762769. The cubic root of 3121421420 is about 1461.4505849387.

Adding to 3121421420 its reverse (241241213), we get a palindrome (3362662633).

The spelling of 3121421420 in words is "three billion, one hundred twenty-one million, four hundred twenty-one thousand, four hundred twenty".