21242110 has 16 divisors (see below), whose sum is σ = 39898656. Its totient is φ = 8127328.

The previous prime is 21242101. The next prime is 21242131. The reversal of 21242110 is 1124212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45949 + ... + 46408.

It is an arithmetic number, because the mean of its divisors is an integer number (2493666).

Almost surely, 2^21242110 is an apocalyptic number.

21242110 is a deficient number, since it is larger than the sum of its proper divisors (18656546).

21242110 is a wasteful number, since it uses less digits than its factorization.

21242110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92387.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21242110 is about 4608.9163585381. The cubic root of 21242110 is about 276.9486278854.

Adding to 21242110 its reverse (1124212), we get a palindrome (22366322).

The spelling of 21242110 in words is "twenty-one million, two hundred forty-two thousand, one hundred ten".