21038023 has 2 divisors, whose sum is σ = 21038024. Its totient is φ = 21038022.

The previous prime is 21038009. The next prime is 21038033. The reversal of 21038023 is 32083012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21038023 - 2¹³ = 21029831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21038033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10519011 + 10519012.

It is an arithmetic number, because the mean of its divisors is an integer number (10519012).

Almost surely, 2^21038023 is an apocalyptic number.

21038023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21038023 is an equidigital number, since it uses as much as digits as its factorization.

21038023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21038023 is about 4586.7224681683. The cubic root of 21038023 is about 276.0588292646.

The spelling of 21038023 in words is "twenty-one million, thirty-eight thousand, twenty-three".