23320421 has 2 divisors, whose sum is σ = 23320422. Its totient is φ = 23320420.

The previous prime is 23320387. The next prime is 23320433. The reversal of 23320421 is 12402332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18369796 + 4950625 = 4286^2 + 2225^2 .

It is a cyclic number.

It is not a de Polignac number, because 23320421 - 2¹⁰ = 23319397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23320421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23326421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11660210 + 11660211.

It is an arithmetic number, because the mean of its divisors is an integer number (11660211).

Almost surely, 2^23320421 is an apocalyptic number.

It is an amenable number.

23320421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23320421 is an equidigital number, since it uses as much as digits as its factorization.

23320421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 23320421 is about 4829.1221769593. The cubic root of 23320421 is about 285.7012422974.

Adding to 23320421 its reverse (12402332), we get a palindrome (35722753).

The spelling of 23320421 in words is "twenty-three million, three hundred twenty thousand, four hundred twenty-one".