21204152023 has 2 divisors, whose sum is σ = 21204152024. Its totient is φ = 21204152022.

The previous prime is 21204151961. The next prime is 21204152033. The reversal of 21204152023 is 32025140212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21204152023 - 2⁹ = 21204151511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21204151985 and 21204152003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21204152033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10602076011 + 10602076012.

It is an arithmetic number, because the mean of its divisors is an integer number (10602076012).

Almost surely, 2^21204152023 is an apocalyptic number.

21204152023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21204152023 is an equidigital number, since it uses as much as digits as its factorization.

21204152023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21204152023 its reverse (32025140212), we get a palindrome (53229292235).

The spelling of 21204152023 in words is "twenty-one billion, two hundred four million, one hundred fifty-two thousand, twenty-three".