21124202313 has 4 divisors (see below), whose sum is σ = 28165603088. Its totient is φ = 14082801540.

The previous prime is 21124202303. The next prime is 21124202347. The reversal of 21124202313 is 31320242112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21124202313 - 2¹² = 21124198217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21124202313.

It is not an unprimeable number, because it can be changed into a prime (21124202303) 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, 3520700383 + ... + 3520700388.

It is an arithmetic number, because the mean of its divisors is an integer number (7041400772).

Almost surely, 2^21124202313 is an apocalyptic number.

It is an amenable number.

21124202313 is a deficient number, since it is larger than the sum of its proper divisors (7041400775).

21124202313 is an equidigital number, since it uses as much as digits as its factorization.

21124202313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7041400774.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21124202313 its reverse (31320242112), we get a palindrome (52444444425).

The spelling of 21124202313 in words is "twenty-one billion, one hundred twenty-four million, two hundred two thousand, three hundred thirteen".