23516315415421 has 2 divisors, whose sum is σ = 23516315415422. Its totient is φ = 23516315415420.

The previous prime is 23516315415407. The next prime is 23516315415457. The reversal of 23516315415421 is 12451451361532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19719328016025 + 3796987399396 = 4440645^2 + 1948586^2 .

It is a cyclic number.

It is not a de Polignac number, because 23516315415421 - 2¹⁵ = 23516315382653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23516315715421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11758157707710 + 11758157707711.

It is an arithmetic number, because the mean of its divisors is an integer number (11758157707711).

Almost surely, 2^{23516315415421} is an apocalyptic number.

It is an amenable number.

23516315415421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23516315415421 is an equidigital number, since it uses as much as digits as its factorization.

23516315415421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 43.

Adding to 23516315415421 its reverse (12451451361532), we get a palindrome (35967766776953).

The spelling of 23516315415421 in words is "twenty-three trillion, five hundred sixteen billion, three hundred fifteen million, four hundred fifteen thousand, four hundred twenty-one".