2130113021 has 4 divisors (see below), whose sum is σ = 2132387292. Its totient is φ = 2127838752.

The previous prime is 2130113003. The next prime is 2130113077. The reversal of 2130113021 is 1203110312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123520996 + 2006592025 = 11114^2 + 44795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2130113021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2130112987 and 2130113005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2130113081) 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, 1135730 + ... + 1137603.

It is an arithmetic number, because the mean of its divisors is an integer number (533096823).

Almost surely, 2^2130113021 is an apocalyptic number.

It is an amenable number.

2130113021 is a deficient number, since it is larger than the sum of its proper divisors (2274271).

2130113021 is an equidigital number, since it uses as much as digits as its factorization.

2130113021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274270.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 2130113021 is about 46153.1474658013. The cubic root of 2130113021 is about 1286.6711079861.

Adding to 2130113021 its reverse (1203110312), we get a palindrome (3333223333).

The spelling of 2130113021 in words is "two billion, one hundred thirty million, one hundred thirteen thousand, twenty-one".