21461775827 has 6 divisors (see below), whose sum is σ = 21998002764. Its totient is φ = 20938316240.

The previous prime is 21461775799. The next prime is 21461775877. The reversal of 21461775827 is 72857716412.

It is not a de Polignac number, because 21461775827 - 2²⁴ = 21444998611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21461775877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6381953 + ... + 6385314.

It is an arithmetic number, because the mean of its divisors is an integer number (3666333794).

Almost surely, 2^21461775827 is an apocalyptic number.

21461775827 is a deficient number, since it is larger than the sum of its proper divisors (536226937).

21461775827 is an equidigital number, since it uses as much as digits as its factorization.

21461775827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12767349 (or 12767308 counting only the distinct ones).

The product of its digits is 1317120, while the sum is 50.

The spelling of 21461775827 in words is "twenty-one billion, four hundred sixty-one million, seven hundred seventy-five thousand, eight hundred twenty-seven".