23397421 has 2 divisors, whose sum is σ = 23397422. Its totient is φ = 23397420.

The previous prime is 23397419. The next prime is 23397427. The reversal of 23397421 is 12479332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19900521 + 3496900 = 4461^2 + 1870^2 .

It is a cyclic number.

It is not a de Polignac number, because 23397421 - 2¹ = 23397419 is a prime.

Together with 23397419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23397427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11698710 + 11698711.

It is an arithmetic number, because the mean of its divisors is an integer number (11698711).

Almost surely, 2^23397421 is an apocalyptic number.

It is an amenable number.

23397421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23397421 is an equidigital number, since it uses as much as digits as its factorization.

23397421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 31.

The square root of 23397421 is about 4837.0880703167. The cubic root of 23397421 is about 286.0153422255.

The spelling of 23397421 in words is "twenty-three million, three hundred ninety-seven thousand, four hundred twenty-one".