21727377761 has 8 divisors (see below), whose sum is σ = 21814376064. Its totient is φ = 21640489920.

The previous prime is 21727377647. The next prime is 21727377803. The reversal of 21727377761 is 16777372712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21727377761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21727377461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378425 + ... + 432041.

It is an arithmetic number, because the mean of its divisors is an integer number (2726797008).

Almost surely, 2^21727377761 is an apocalyptic number.

It is an amenable number.

21727377761 is a deficient number, since it is larger than the sum of its proper divisors (86998303).

21727377761 is a wasteful number, since it uses less digits than its factorization.

21727377761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55231.

The product of its digits is 1210104, while the sum is 50.

The spelling of 21727377761 in words is "twenty-one billion, seven hundred twenty-seven million, three hundred seventy-seven thousand, seven hundred sixty-one".