21185052475 has 6 divisors (see below), whose sum is σ = 26269465100. Its totient is φ = 16948041960.

The previous prime is 21185052467. The next prime is 21185052487. The reversal of 21185052475 is 57425058112.

It is not a de Polignac number, because 21185052475 - 2³ = 21185052467 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 423701025 + ... + 423701074.

Almost surely, 2^21185052475 is an apocalyptic number.

21185052475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21185052475 is a deficient number, since it is larger than the sum of its proper divisors (5084412625).

21185052475 is an equidigital number, since it uses as much as digits as its factorization.

21185052475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847402109 (or 847402104 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 40.

The spelling of 21185052475 in words is "twenty-one billion, one hundred eighty-five million, fifty-two thousand, four hundred seventy-five".