21834210 has 16 divisors (see below), whose sum is σ = 52402176. Its totient is φ = 5822448.

The previous prime is 21834203. The next prime is 21834233. The reversal of 21834210 is 1243812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363874 + ... + 363933.

It is an arithmetic number, because the mean of its divisors is an integer number (3275136).

Almost surely, 2^21834210 is an apocalyptic number.

21834210 is an abundant number, since it is smaller than the sum of its proper divisors (30567966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21834210 is a wasteful number, since it uses less digits than its factorization.

21834210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727817.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21834210 is about 4672.7090643437. The cubic root of 21834210 is about 279.4982937525.

The spelling of 21834210 in words is "twenty-one million, eight hundred thirty-four thousand, two hundred ten".