21676454799 has 4 divisors (see below), whose sum is σ = 28901939736. Its totient is φ = 14450969864.

The previous prime is 21676454777. The next prime is 21676454867. The reversal of 21676454799 is 99745467612.

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 21676454799 - 2¹³ = 21676446607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676454749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3612742464 + ... + 3612742469.

It is an arithmetic number, because the mean of its divisors is an integer number (7225484934).

Almost surely, 2^21676454799 is an apocalyptic number.

21676454799 is a deficient number, since it is larger than the sum of its proper divisors (7225484937).

21676454799 is an equidigital number, since it uses as much as digits as its factorization.

21676454799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7225484936.

The product of its digits is 22861440, while the sum is 60.

The spelling of 21676454799 in words is "twenty-one billion, six hundred seventy-six million, four hundred fifty-four thousand, seven hundred ninety-nine".