21075526465 has 48 divisors (see below), whose sum is σ = 31033134720. Its totient is φ = 13662432000.

The previous prime is 21075526453. The next prime is 21075526519. The reversal of 21075526465 is 56462557012.

It is not a de Polignac number, because 21075526465 - 2⁷ = 21075526337 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2336965 + ... + 2345965.

It is an arithmetic number, because the mean of its divisors is an integer number (646523640).

Almost surely, 2^21075526465 is an apocalyptic number.

It is an amenable number.

21075526465 is a deficient number, since it is larger than the sum of its proper divisors (9957608255).

21075526465 is a wasteful number, since it uses less digits than its factorization.

21075526465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9542 (or 9535 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 43.

The spelling of 21075526465 in words is "twenty-one billion, seventy-five million, five hundred twenty-six thousand, four hundred sixty-five".