21935210 has 16 divisors (see below), whose sum is σ = 43072992. Its totient is φ = 7976400.

The previous prime is 21935183. The next prime is 21935213. The reversal of 21935210 is 1253912.

It is not an unprimeable number, because it can be changed into a prime (21935213) 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, 99596 + ... + 99815.

It is an arithmetic number, because the mean of its divisors is an integer number (2692062).

Almost surely, 2^21935210 is an apocalyptic number.

21935210 is a deficient number, since it is larger than the sum of its proper divisors (21137782).

21935210 is a wasteful number, since it uses less digits than its factorization.

21935210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199429.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 21935210 is about 4683.5040301040. The cubic root of 21935210 is about 279.9285957380.

The spelling of 21935210 in words is "twenty-one million, nine hundred thirty-five thousand, two hundred ten".