21140099 has 4 divisors (see below), whose sum is σ = 21486720. Its totient is φ = 20793480.

The previous prime is 21140089. The next prime is 21140107. The reversal of 21140099 is 99004112.

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 21140099 - 2²⁰ = 20091523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140069) 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, 173219 + ... + 173340.

It is an arithmetic number, because the mean of its divisors is an integer number (5371680).

Almost surely, 2^21140099 is an apocalyptic number.

21140099 is a deficient number, since it is larger than the sum of its proper divisors (346621).

21140099 is an equidigital number, since it uses as much as digits as its factorization.

21140099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346620.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 21140099 is about 4597.8363389751. The cubic root of 21140099 is about 276.5045861199.

The spelling of 21140099 in words is "twenty-one million, one hundred forty thousand, ninety-nine".