21503482523 has 2 divisors, whose sum is σ = 21503482524. Its totient is φ = 21503482522.

The previous prime is 21503482501. The next prime is 21503482531. The reversal of 21503482523 is 32528430512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21503482523 - 2⁶ = 21503482459 is a prime.

It is not a weakly prime, because it can be changed into another prime (21503482543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10751741261 + 10751741262.

It is an arithmetic number, because the mean of its divisors is an integer number (10751741262).

Almost surely, 2^21503482523 is an apocalyptic number.

21503482523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21503482523 is an equidigital number, since it uses as much as digits as its factorization.

21503482523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 21503482523 in words is "twenty-one billion, five hundred three million, four hundred eighty-two thousand, five hundred twenty-three".