3120400921 has 4 divisors (see below), whose sum is σ = 3404073744. Its totient is φ = 2836728100.

The previous prime is 3120400901. The next prime is 3120400931. The reversal of 3120400921 is 1290040213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3120400921 - 2⁵ = 3120400889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3120400892 and 3120400901.

It is not an unprimeable number, because it can be changed into a prime (3120400901) 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, 141836395 + ... + 141836416.

It is an arithmetic number, because the mean of its divisors is an integer number (851018436).

Almost surely, 2^3120400921 is an apocalyptic number.

It is an amenable number.

3120400921 is a deficient number, since it is larger than the sum of its proper divisors (283672823).

3120400921 is a wasteful number, since it uses less digits than its factorization.

3120400921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283672822.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 3120400921 is about 55860.5488784348. The cubic root of 3120400921 is about 1461.2913015846.

The spelling of 3120400921 in words is "three billion, one hundred twenty million, four hundred thousand, nine hundred twenty-one".