23404021 has 2 divisors, whose sum is σ = 23404022. Its totient is φ = 23404020.

The previous prime is 23404009. The next prime is 23404033. The reversal of 23404021 is 12040432.

It is a balanced prime because it is at equal distance from previous prime (23404009) and next prime (23404033).

It can be written as a sum of positive squares in only one way, i.e., 19847025 + 3556996 = 4455^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 23404021 - 2¹³ = 23395829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23403986 and 23404004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23404001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11702010 + 11702011.

It is an arithmetic number, because the mean of its divisors is an integer number (11702011).

Almost surely, 2^23404021 is an apocalyptic number.

It is an amenable number.

23404021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23404021 is an equidigital number, since it uses as much as digits as its factorization.

23404021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 23404021 is about 4837.7702508490. The cubic root of 23404021 is about 286.0422329925.

Adding to 23404021 its reverse (12040432), we get a palindrome (35444453).

The spelling of 23404021 in words is "twenty-three million, four hundred four thousand, twenty-one".