21592545491 has 16 divisors (see below), whose sum is σ = 24171019488. Its totient is φ = 19118284800.

The previous prime is 21592545419. The next prime is 21592545511. The reversal of 21592545491 is 19454529512.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21592545491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21592547491) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 227075 + ... + 307811.

It is an arithmetic number, because the mean of its divisors is an integer number (1510688718).

Almost surely, 2^21592545491 is an apocalyptic number.

21592545491 is a deficient number, since it is larger than the sum of its proper divisors (2578473997).

21592545491 is a wasteful number, since it uses less digits than its factorization.

21592545491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81382.

The product of its digits is 648000, while the sum is 47.

The spelling of 21592545491 in words is "twenty-one billion, five hundred ninety-two million, five hundred forty-five thousand, four hundred ninety-one".