23313021213421 has 2 divisors, whose sum is σ = 23313021213422. Its totient is φ = 23313021213420.

The previous prime is 23313021213397. The next prime is 23313021213473. The reversal of 23313021213421 is 12431212031332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19914031200196 + 3398990013225 = 4462514^2 + 1843635^2 .

It is a cyclic number.

It is not a de Polignac number, because 23313021213421 - 2²⁷ = 23312886995693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23313021213421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23313021219421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11656510606710 + 11656510606711.

It is an arithmetic number, because the mean of its divisors is an integer number (11656510606711).

Almost surely, 2^{23313021213421} is an apocalyptic number.

It is an amenable number.

23313021213421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23313021213421 is an equidigital number, since it uses as much as digits as its factorization.

23313021213421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 23313021213421 its reverse (12431212031332), we get a palindrome (35744233244753).

The spelling of 23313021213421 in words is "twenty-three trillion, three hundred thirteen billion, twenty-one million, two hundred thirteen thousand, four hundred twenty-one".