21660048811 has 8 divisors (see below), whose sum is σ = 22801978880. Its totient is φ = 20518311528.

The previous prime is 21660048803. The next prime is 21660048821. The reversal of 21660048811 is 11884006612.

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

It is a cyclic number.

It is not a de Polignac number, because 21660048811 - 2³ = 21660048803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21660048821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221050 + ... + 303616.

It is an arithmetic number, because the mean of its divisors is an integer number (2850247360).

Almost surely, 2^21660048811 is an apocalyptic number.

21660048811 is a deficient number, since it is larger than the sum of its proper divisors (1141930069).

21660048811 is a wasteful number, since it uses less digits than its factorization.

21660048811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96393.

The product of its (nonzero) digits is 18432, while the sum is 37.

The spelling of 21660048811 in words is "twenty-one billion, six hundred sixty million, forty-eight thousand, eight hundred eleven".