21341899 has 4 divisors (see below), whose sum is σ = 21541464. Its totient is φ = 21142336.

The previous prime is 21341897. The next prime is 21341911. The reversal of 21341899 is 99814312.

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 21341899 - 2¹ = 21341897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21341897) 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 3 ways as a sum of consecutive naturals, for example, 99622 + ... + 99835.

It is an arithmetic number, because the mean of its divisors is an integer number (5385366).

Almost surely, 2^21341899 is an apocalyptic number.

21341899 is a deficient number, since it is larger than the sum of its proper divisors (199565).

21341899 is a wasteful number, since it uses less digits than its factorization.

21341899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199564.

The product of its digits is 15552, while the sum is 37.

The square root of 21341899 is about 4619.7293210750. The cubic root of 21341899 is about 277.3816241581.

The spelling of 21341899 in words is "twenty-one million, three hundred forty-one thousand, eight hundred ninety-nine".