21130321313 has 8 divisors (see below), whose sum is σ = 21347879400. Its totient is φ = 20913773440.

The previous prime is 21130321253. The next prime is 21130321337. The reversal of 21130321313 is 31312303112.

It can be written as a sum of positive squares in 4 ways, for example, as 5693004304 + 15437317009 = 75452^2 + 124247^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21130321313 - 2⁸ = 21130321057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21130321013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210470 + ... + 294207.

It is an arithmetic number, because the mean of its divisors is an integer number (2668484925).

Almost surely, 2^21130321313 is an apocalyptic number.

It is an amenable number.

21130321313 is a deficient number, since it is larger than the sum of its proper divisors (217558087).

21130321313 is a wasteful number, since it uses less digits than its factorization.

21130321313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505107.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21130321313 its reverse (31312303112), we get a palindrome (52442624425).

The spelling of 21130321313 in words is "twenty-one billion, one hundred thirty million, three hundred twenty-one thousand, three hundred thirteen".