21484199 has 4 divisors (see below), whose sum is σ = 23437320. Its totient is φ = 19531080.

The previous prime is 21484187. The next prime is 21484213. The reversal of 21484199 is 99148412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21484199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21484399) 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, 976544 + ... + 976565.

It is an arithmetic number, because the mean of its divisors is an integer number (5859330).

Almost surely, 2^21484199 is an apocalyptic number.

21484199 is a deficient number, since it is larger than the sum of its proper divisors (1953121).

21484199 is a wasteful number, since it uses less digits than its factorization.

21484199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953120.

The product of its digits is 20736, while the sum is 38.

The square root of 21484199 is about 4635.1050689278. The cubic root of 21484199 is about 277.9967522006.

The spelling of 21484199 in words is "twenty-one million, four hundred eighty-four thousand, one hundred ninety-nine".