21838699 has 4 divisors (see below), whose sum is σ = 21891240. Its totient is φ = 21786160.

The previous prime is 21838679. The next prime is 21838723. The reversal of 21838699 is 99683812.

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 21838699 - 2¹¹ = 21836651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21838639) 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, 25642 + ... + 26479.

It is an arithmetic number, because the mean of its divisors is an integer number (5472810).

Almost surely, 2^21838699 is an apocalyptic number.

21838699 is a deficient number, since it is larger than the sum of its proper divisors (52541).

21838699 is an equidigital number, since it uses as much as digits as its factorization.

21838699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52540.

The product of its digits is 186624, while the sum is 46.

The square root of 21838699 is about 4673.1893819960. The cubic root of 21838699 is about 279.5174469051.

The spelling of 21838699 in words is "twenty-one million, eight hundred thirty-eight thousand, six hundred ninety-nine".