21313000311 has 4 divisors (see below), whose sum is σ = 28417333752. Its totient is φ = 14208666872.

The previous prime is 21313000273. The next prime is 21313000327. The reversal of 21313000311 is 11300031312.

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

It is a cyclic number.

It is not a de Polignac number, because 21313000311 - 2¹⁰ = 21312999287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313000411) 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, 3552166716 + ... + 3552166721.

It is an arithmetic number, because the mean of its divisors is an integer number (7104333438).

Almost surely, 2^21313000311 is an apocalyptic number.

21313000311 is a deficient number, since it is larger than the sum of its proper divisors (7104333441).

21313000311 is an equidigital number, since it uses as much as digits as its factorization.

21313000311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104333440.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 21313000311 its reverse (11300031312), we get a palindrome (32613031623).

The spelling of 21313000311 in words is "twenty-one billion, three hundred thirteen million, three hundred eleven", and thus it is an aban number.