21424634 has 16 divisors (see below), whose sum is σ = 40067136. Its totient is φ = 8347200.

The previous prime is 21424631. The next prime is 21424651. The reversal of 21424634 is 43642412.

It is not an unprimeable number, because it can be changed into a prime (21424631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69407 + ... + 69714.

It is an arithmetic number, because the mean of its divisors is an integer number (2504196).

Almost surely, 2^21424634 is an apocalyptic number.

21424634 is a deficient number, since it is larger than the sum of its proper divisors (18642502).

21424634 is a wasteful number, since it uses less digits than its factorization.

21424634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139141.

The product of its digits is 4608, while the sum is 26.

The square root of 21424634 is about 4628.6751884314. The cubic root of 21424634 is about 277.7395988179.

It can be divided in two parts, 2142 and 4634, that added together give a palindrome (6776).

The spelling of 21424634 in words is "twenty-one million, four hundred twenty-four thousand, six hundred thirty-four".