21525168479 has 2 divisors, whose sum is σ = 21525168480. Its totient is φ = 21525168478.

The previous prime is 21525168421. The next prime is 21525168517. The reversal of 21525168479 is 97486152512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21525168479 - 2¹² = 21525164383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21525168779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10762584239 + 10762584240.

It is an arithmetic number, because the mean of its divisors is an integer number (10762584240).

Almost surely, 2^21525168479 is an apocalyptic number.

21525168479 is a deficient number, since it is larger than the sum of its proper divisors (1).

21525168479 is an equidigital number, since it uses as much as digits as its factorization.

21525168479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 50.

The spelling of 21525168479 in words is "twenty-one billion, five hundred twenty-five million, one hundred sixty-eight thousand, four hundred seventy-nine".