21211012313 has 4 divisors (see below), whose sum is σ = 21239950308. Its totient is φ = 21182074320.

The previous prime is 21211012301. The next prime is 21211012357. The reversal of 21211012313 is 31321011212.

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 16598972569 + 4612039744 = 128837^2 + 67912^2 .

It is a cyclic number.

It is not a de Polignac number, because 21211012313 - 2²⁸ = 20942576857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21211012291 and 21211012300.

It is not an unprimeable number, because it can be changed into a prime (21211012373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14467898 + ... + 14469363.

It is an arithmetic number, because the mean of its divisors is an integer number (5309987577).

Almost surely, 2^21211012313 is an apocalyptic number.

It is an amenable number.

21211012313 is a deficient number, since it is larger than the sum of its proper divisors (28937995).

21211012313 is an equidigital number, since it uses as much as digits as its factorization.

21211012313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28937994.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21211012313 its reverse (31321011212), we get a palindrome (52532023525).

The spelling of 21211012313 in words is "twenty-one billion, two hundred eleven million, twelve thousand, three hundred thirteen".