21023130313 has 4 divisors (see below), whose sum is σ = 21209175828. Its totient is φ = 20837084800.

The previous prime is 21023130281. The next prime is 21023130319. The reversal of 21023130313 is 31303132012.

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 117440569 + 20905689744 = 10837^2 + 144588^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023130313 - 2⁵ = 21023130281 is a prime.

It is a super-3 number, since 3×21023130313³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21023130319) 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, 93022588 + ... + 93022813.

It is an arithmetic number, because the mean of its divisors is an integer number (5302293957).

Almost surely, 2^21023130313 is an apocalyptic number.

It is an amenable number.

21023130313 is a deficient number, since it is larger than the sum of its proper divisors (186045515).

21023130313 is a wasteful number, since it uses less digits than its factorization.

21023130313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186045514.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21023130313 its reverse (31303132012), we get a palindrome (52326262325).

The spelling of 21023130313 in words is "twenty-one billion, twenty-three million, one hundred thirty thousand, three hundred thirteen".