23213430421 has 2 divisors, whose sum is σ = 23213430422. Its totient is φ = 23213430420.

The previous prime is 23213430397. The next prime is 23213430431. The reversal of 23213430421 is 12403431232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14409361521 + 8804068900 = 120039^2 + 93830^2 .

It is a cyclic number.

It is not a de Polignac number, because 23213430421 - 2⁷ = 23213430293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23213430431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11606715210 + 11606715211.

It is an arithmetic number, because the mean of its divisors is an integer number (11606715211).

Almost surely, 2^23213430421 is an apocalyptic number.

It is an amenable number.

23213430421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23213430421 is an equidigital number, since it uses as much as digits as its factorization.

23213430421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 23213430421 its reverse (12403431232), we get a palindrome (35616861653).

The spelling of 23213430421 in words is "twenty-three billion, two hundred thirteen million, four hundred thirty thousand, four hundred twenty-one".