21203000023 has 2 divisors, whose sum is σ = 21203000024. Its totient is φ = 21203000022.

The previous prime is 21203000017. The next prime is 21203000051. The reversal of 21203000023 is 32000030212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21203000023 - 2⁹ = 21202999511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202999967 and 21203000012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203000003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601500011 + 10601500012.

It is an arithmetic number, because the mean of its divisors is an integer number (10601500012).

Almost surely, 2^21203000023 is an apocalyptic number.

21203000023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203000023 is an equidigital number, since it uses as much as digits as its factorization.

21203000023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 21203000023 its reverse (32000030212), we get a palindrome (53203030235).

The spelling of 21203000023 in words is "twenty-one billion, two hundred three million, twenty-three", and thus it is an aban number.