2130013021 has 4 divisors (see below), whose sum is σ = 2130168412. Its totient is φ = 2129857632.

The previous prime is 2130013019. The next prime is 2130013027. The reversal of 2130013021 is 1203100312.

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 1970116996 + 159896025 = 44386^2 + 12645^2 .

It is a cyclic number.

It is not a de Polignac number, because 2130013021 - 2¹ = 2130013019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2130012992 and 2130013010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2130013027) 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, 54906 + ... + 85291.

It is an arithmetic number, because the mean of its divisors is an integer number (532542103).

Almost surely, 2^2130013021 is an apocalyptic number.

It is an amenable number.

2130013021 is a deficient number, since it is larger than the sum of its proper divisors (155391).

2130013021 is a wasteful number, since it uses less digits than its factorization.

2130013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155390.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 2130013021 is about 46152.0641033530. The cubic root of 2130013021 is about 1286.6509730413.

Adding to 2130013021 its reverse (1203100312), we get a palindrome (3333113333).

The spelling of 2130013021 in words is "two billion, one hundred thirty million, thirteen thousand, twenty-one".