21099214 has 4 divisors (see below), whose sum is σ = 31648824. Its totient is φ = 10549606.

The previous prime is 21099187. The next prime is 21099277. The reversal of 21099214 is 41299012.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5274802 + ... + 5274805.

It is an arithmetic number, because the mean of its divisors is an integer number (7912206).

Almost surely, 2^21099214 is an apocalyptic number.

21099214 is a deficient number, since it is larger than the sum of its proper divisors (10549610).

21099214 is a wasteful number, since it uses less digits than its factorization.

21099214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10549609.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 21099214 is about 4593.3880741779. The cubic root of 21099214 is about 276.3262175806.

The spelling of 21099214 in words is "twenty-one million, ninety-nine thousand, two hundred fourteen".