21310313113 has 4 divisors (see below), whose sum is σ = 22431908560. Its totient is φ = 20188717668.

The previous prime is 21310313083. The next prime is 21310313131. The reversal of 21310313113 is 31131301312.

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 a cyclic number.

It is not a de Polignac number, because 21310313113 - 2¹⁷ = 21310182041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1121595427 = 21310313113 / (2 + 1 + 3 + 1 + 0 + 3 + 1 + 3 + 1 + 1 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310313153) 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, 560797695 + ... + 560797732.

It is an arithmetic number, because the mean of its divisors is an integer number (5607977140).

Almost surely, 2^21310313113 is an apocalyptic number.

It is an amenable number.

21310313113 is a deficient number, since it is larger than the sum of its proper divisors (1121595447).

21310313113 is a wasteful number, since it uses less digits than its factorization.

21310313113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121595446.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21310313113 its reverse (31131301312), we get a palindrome (52441614425).

The spelling of 21310313113 in words is "twenty-one billion, three hundred ten million, three hundred thirteen thousand, one hundred thirteen".