2130120321 has 16 divisors (see below), whose sum is σ = 3387024384. Its totient is φ = 1164289104.

The previous prime is 2130120313. The next prime is 2130120331. The reversal of 2130120321 is 1230210312.

It is not a de Polignac number, because 2130120321 - 2³ = 2130120313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2130120321.

It is not an unprimeable number, because it can be changed into a prime (2130120331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2204611 + ... + 2205576.

It is an arithmetic number, because the mean of its divisors is an integer number (211689024).

Almost surely, 2^2130120321 is an apocalyptic number.

2130120321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2130120321 is a deficient number, since it is larger than the sum of its proper divisors (1256904063).

2130120321 is a wasteful number, since it uses less digits than its factorization.

2130120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410220.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2130120321 is about 46153.2265502641. The cubic root of 2130120321 is about 1286.6725778124.

Adding to 2130120321 its reverse (1230210312), we get a palindrome (3360330633).

The spelling of 2130120321 in words is "two billion, one hundred thirty million, one hundred twenty thousand, three hundred twenty-one".