21402113313 has 16 divisors (see below), whose sum is σ = 32614968320. Its totient is φ = 12228944976.

The previous prime is 21402113273. The next prime is 21402113353. The reversal of 21402113313 is 31331120412.

It is an interprime number because it is at equal distance from previous prime (21402113273) and next prime (21402113353).

It is not a de Polignac number, because 21402113313 - 2⁹ = 21402112801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 21402113313.

It is not an unprimeable number, because it can be changed into a prime (21402113353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417156 + ... + 465642.

It is an arithmetic number, because the mean of its divisors is an integer number (2038435520).

Almost surely, 2^21402113313 is an apocalyptic number.

It is an amenable number.

21402113313 is a deficient number, since it is larger than the sum of its proper divisors (11212855007).

21402113313 is a wasteful number, since it uses less digits than its factorization.

21402113313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69516.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21402113313 its reverse (31331120412), we get a palindrome (52733233725).

The spelling of 21402113313 in words is "twenty-one billion, four hundred two million, one hundred thirteen thousand, three hundred thirteen".