21147577475 has 12 divisors (see below), whose sum is σ = 26227781880. Its totient is φ = 16914974400.

The previous prime is 21147577469. The next prime is 21147577483. The reversal of 21147577475 is 57477574112.

It is not a de Polignac number, because 21147577475 - 2²⁴ = 21130800259 is a prime.

It is a super-2 number, since 2×21147577475² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67880 + ... + 216570.

It is an arithmetic number, because the mean of its divisors is an integer number (2185648490).

Almost surely, 2^21147577475 is an apocalyptic number.

21147577475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21147577475 is a deficient number, since it is larger than the sum of its proper divisors (5080204405).

21147577475 is a wasteful number, since it uses less digits than its factorization.

21147577475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154390 (or 154385 counting only the distinct ones).

The product of its digits is 1920800, while the sum is 50.

The spelling of 21147577475 in words is "twenty-one billion, one hundred forty-seven million, five hundred seventy-seven thousand, four hundred seventy-five".