21123100324313 has 4 divisors (see below), whose sum is σ = 22747954195428. Its totient is φ = 19498246453200.

The previous prime is 21123100324303. The next prime is 21123100324363. The reversal of 21123100324313 is 31342300132112.

It is a happy number.

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 2735358747664 + 18387741576649 = 1653892^2 + 4288093^2 .

It is a cyclic number.

It is not a de Polignac number, because 21123100324313 - 2⁸ = 21123100324057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123100324303) 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, 812426935538 + ... + 812426935563.

It is an arithmetic number, because the mean of its divisors is an integer number (5686988548857).

Almost surely, 2^{21123100324313} is an apocalyptic number.

It is an amenable number.

21123100324313 is a deficient number, since it is larger than the sum of its proper divisors (1624853871115).

21123100324313 is a wasteful number, since it uses less digits than its factorization.

21123100324313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624853871114.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21123100324313 its reverse (31342300132112), we get a palindrome (52465400456425).

The spelling of 21123100324313 in words is "twenty-one trillion, one hundred twenty-three billion, one hundred million, three hundred twenty-four thousand, three hundred thirteen".