21899210 has 16 divisors (see below), whose sum is σ = 41493600. Its totient is φ = 8298576.

The previous prime is 21899201. The next prime is 21899219. The reversal of 21899210 is 1299812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21899201) and next prime (21899219).

It is not an unprimeable number, because it can be changed into a prime (21899219) 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 7 ways as a sum of consecutive naturals, for example, 57440 + ... + 57819.

It is an arithmetic number, because the mean of its divisors is an integer number (2593350).

Almost surely, 2^21899210 is an apocalyptic number.

21899210 is a deficient number, since it is larger than the sum of its proper divisors (19594390).

21899210 is a wasteful number, since it uses less digits than its factorization.

21899210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115285.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 21899210 is about 4679.6591756238. The cubic root of 21899210 is about 279.7753725640.

The spelling of 21899210 in words is "twenty-one million, eight hundred ninety-nine thousand, two hundred ten".