21013382699 has 4 divisors (see below), whose sum is σ = 21020535480. Its totient is φ = 21006229920.

The previous prime is 21013382681. The next prime is 21013382723. The reversal of 21013382699 is 99628331012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21013382699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013382669) 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, 3571982 + ... + 3577859.

It is an arithmetic number, because the mean of its divisors is an integer number (5255133870).

Almost surely, 2^21013382699 is an apocalyptic number.

21013382699 is a deficient number, since it is larger than the sum of its proper divisors (7152781).

21013382699 is an equidigital number, since it uses as much as digits as its factorization.

21013382699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7152780.

The product of its (nonzero) digits is 139968, while the sum is 44.

The spelling of 21013382699 in words is "twenty-one billion, thirteen million, three hundred eighty-two thousand, six hundred ninety-nine".