21694099 has 8 divisors (see below), whose sum is σ = 25463648. Its totient is φ = 18092160.

The previous prime is 21694069. The next prime is 21694133. The reversal of 21694099 is 99049612.

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 21694099 - 2²¹ = 19596947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21694009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41622 + ... + 42139.

It is an arithmetic number, because the mean of its divisors is an integer number (3182956).

Almost surely, 2^21694099 is an apocalyptic number.

21694099 is a deficient number, since it is larger than the sum of its proper divisors (3769549).

21694099 is an equidigital number, since it uses as much as digits as its factorization.

21694099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83805.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 21694099 is about 4657.6924544242. The cubic root of 21694099 is about 278.8991597820.

The spelling of 21694099 in words is "twenty-one million, six hundred ninety-four thousand, ninety-nine".