21716754811 has 4 divisors (see below), whose sum is σ = 22178813472. Its totient is φ = 21254696152.

The previous prime is 21716754799. The next prime is 21716754841. The reversal of 21716754811 is 11845761712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21716754811 - 2¹¹ = 21716752763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21716754841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231029260 + ... + 231029353.

It is an arithmetic number, because the mean of its divisors is an integer number (5544703368).

Almost surely, 2^21716754811 is an apocalyptic number.

21716754811 is a deficient number, since it is larger than the sum of its proper divisors (462058661).

21716754811 is an equidigital number, since it uses as much as digits as its factorization.

21716754811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462058660.

The product of its digits is 94080, while the sum is 43.

The spelling of 21716754811 in words is "twenty-one billion, seven hundred sixteen million, seven hundred fifty-four thousand, eight hundred eleven".