21163525745 has 16 divisors (see below), whose sum is σ = 26015858688. Its totient is φ = 16522107840.

The previous prime is 21163525711. The next prime is 21163525751. The reversal of 21163525745 is 54752536112.

It is not a de Polignac number, because 21163525745 - 2⁶ = 21163525681 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 234449 + ... + 311918.

It is an arithmetic number, because the mean of its divisors is an integer number (1625991168).

Almost surely, 2^21163525745 is an apocalyptic number.

It is an amenable number.

21163525745 is a deficient number, since it is larger than the sum of its proper divisors (4852332943).

21163525745 is a wasteful number, since it uses less digits than its factorization.

21163525745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546560.

The product of its digits is 252000, while the sum is 41.

The spelling of 21163525745 in words is "twenty-one billion, one hundred sixty-three million, five hundred twenty-five thousand, seven hundred forty-five".