21089083699 has 4 divisors (see below), whose sum is σ = 21093830464. Its totient is φ = 21084336936.

The previous prime is 21089083693. The next prime is 21089083703. The reversal of 21089083699 is 99638098012.

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 21089083699 - 2⁹ = 21089083187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21089083693) 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, 2366712 + ... + 2375605.

It is an arithmetic number, because the mean of its divisors is an integer number (5273457616).

Almost surely, 2^21089083699 is an apocalyptic number.

21089083699 is a deficient number, since it is larger than the sum of its proper divisors (4746765).

21089083699 is an equidigital number, since it uses as much as digits as its factorization.

21089083699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4746764.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 21089083699 in words is "twenty-one billion, eighty-nine million, eighty-three thousand, six hundred ninety-nine".