23345425421 has 2 divisors, whose sum is σ = 23345425422. Its totient is φ = 23345425420.

The previous prime is 23345425393. The next prime is 23345425463. The reversal of 23345425421 is 12452454332.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20223968521 + 3121456900 = 142211^2 + 55870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23345425421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23345425721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11672712710 + 11672712711.

It is an arithmetic number, because the mean of its divisors is an integer number (11672712711).

Almost surely, 2^23345425421 is an apocalyptic number.

It is an amenable number.

23345425421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23345425421 is an equidigital number, since it uses as much as digits as its factorization.

23345425421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 35.

Adding to 23345425421 its reverse (12452454332), we get a palindrome (35797879753).

The spelling of 23345425421 in words is "twenty-three billion, three hundred forty-five million, four hundred twenty-five thousand, four hundred twenty-one".