21503230523 has 2 divisors, whose sum is σ = 21503230524. Its totient is φ = 21503230522.

The previous prime is 21503230501. The next prime is 21503230537. The reversal of 21503230523 is 32503230512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21503230523 - 2⁸ = 21503230267 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21503230492 and 21503230501.

It is not a weakly prime, because it can be changed into another prime (21503233523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10751615261 + 10751615262.

It is an arithmetic number, because the mean of its divisors is an integer number (10751615262).

Almost surely, 2^21503230523 is an apocalyptic number.

21503230523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21503230523 is an equidigital number, since it uses as much as digits as its factorization.

21503230523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 26.

The spelling of 21503230523 in words is "twenty-one billion, five hundred three million, two hundred thirty thousand, five hundred twenty-three".