21766847241 has 16 divisors (see below), whose sum is σ = 30709923840. Its totient is φ = 13675499280.

The previous prime is 21766847171. The next prime is 21766847251. The reversal of 21766847241 is 14274866712.

It is not a de Polignac number, because 21766847241 - 2¹¹ = 21766845193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21766847251) 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 15 ways as a sum of consecutive naturals, for example, 988785 + ... + 1010558.

It is an arithmetic number, because the mean of its divisors is an integer number (1919370240).

Almost surely, 2^21766847241 is an apocalyptic number.

It is an amenable number.

21766847241 is a deficient number, since it is larger than the sum of its proper divisors (8943076599).

21766847241 is a wasteful number, since it uses less digits than its factorization.

21766847241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999556.

The product of its digits is 903168, while the sum is 48.

The spelling of 21766847241 in words is "twenty-one billion, seven hundred sixty-six million, eight hundred forty-seven thousand, two hundred forty-one".