21446099 has 4 divisors (see below), whose sum is σ = 21516264. Its totient is φ = 21375936.

The previous prime is 21446093. The next prime is 21446101. The reversal of 21446099 is 99064412.

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 21446099 - 2⁴ = 21446083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21446093) 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, 34622 + ... + 35235.

It is an arithmetic number, because the mean of its divisors is an integer number (5379066).

Almost surely, 2^21446099 is an apocalyptic number.

21446099 is a deficient number, since it is larger than the sum of its proper divisors (70165).

21446099 is an equidigital number, since it uses as much as digits as its factorization.

21446099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70164.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 21446099 is about 4630.9933059766. The cubic root of 21446099 is about 277.8323221542.

The spelling of 21446099 in words is "twenty-one million, four hundred forty-six thousand, ninety-nine".