21123232210313 has 4 divisors (see below), whose sum is σ = 21851619527940. Its totient is φ = 20394844892688.

The previous prime is 21123232210279. The next prime is 21123232210321. The reversal of 21123232210313 is 31301223232112.

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 12103253134729 + 9019979075584 = 3478973^2 + 3003328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21123232210313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123232218313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364193658770 + ... + 364193658827.

It is an arithmetic number, because the mean of its divisors is an integer number (5462904881985).

Almost surely, 2^{21123232210313} is an apocalyptic number.

It is an amenable number.

21123232210313 is a deficient number, since it is larger than the sum of its proper divisors (728387317627).

21123232210313 is an equidigital number, since it uses as much as digits as its factorization.

21123232210313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728387317626.

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

Adding to 21123232210313 its reverse (31301223232112), we get a palindrome (52424455442425).

The spelling of 21123232210313 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred thirty-two million, two hundred ten thousand, three hundred thirteen".