21411899 has 6 divisors (see below), whose sum is σ = 21636300. Its totient is φ = 21189800.

The previous prime is 21411883. The next prime is 21411911. The reversal of 21411899 is 99811412.

It is not a de Polignac number, because 21411899 - 2⁴ = 21411883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21411809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9152 + ... + 11250.

It is an arithmetic number, because the mean of its divisors is an integer number (3606050).

Almost surely, 2^21411899 is an apocalyptic number.

21411899 is a deficient number, since it is larger than the sum of its proper divisors (224401).

21411899 is an equidigital number, since it uses as much as digits as its factorization.

21411899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301 (or 2200 counting only the distinct ones).

The product of its digits is 5184, while the sum is 35.

The square root of 21411899 is about 4627.2993203379. The cubic root of 21411899 is about 277.6845575847.

The spelling of 21411899 in words is "twenty-one million, four hundred eleven thousand, eight hundred ninety-nine".