21854761799 has 8 divisors (see below), whose sum is σ = 24774629040. Its totient is φ = 19111856256.

The previous prime is 21854761783. The next prime is 21854761807. The reversal of 21854761799 is 99716745812.

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 21854761799 - 2⁴ = 21854761783 is a prime.

It is a super-2 number, since 2×21854761799² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21854761199) 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, 44240162 + ... + 44240655.

It is an arithmetic number, because the mean of its divisors is an integer number (3096828630).

Almost surely, 2^21854761799 is an apocalyptic number.

21854761799 is a deficient number, since it is larger than the sum of its proper divisors (2919867241).

21854761799 is a wasteful number, since it uses less digits than its factorization.

21854761799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88480849.

The product of its digits is 7620480, while the sum is 59.

The spelling of 21854761799 in words is "twenty-one billion, eight hundred fifty-four million, seven hundred sixty-one thousand, seven hundred ninety-nine".