21624034 has 16 divisors (see below), whose sum is σ = 34432128. Its totient is φ = 10149952.

The previous prime is 21624023. The next prime is 21624041. The reversal of 21624034 is 43042612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21623996 and 21624014.

It is an unprimeable number.

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, 21507 + ... + 22489.

It is an arithmetic number, because the mean of its divisors is an integer number (2152008).

Almost surely, 2^21624034 is an apocalyptic number.

21624034 is a deficient number, since it is larger than the sum of its proper divisors (12808094).

21624034 is a wasteful number, since it uses less digits than its factorization.

21624034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 21624034 is about 4650.1649433112. The cubic root of 21624034 is about 278.5985842724.

Adding to 21624034 its reverse (43042612), we get a palindrome (64666646).

The spelling of 21624034 in words is "twenty-one million, six hundred twenty-four thousand, thirty-four".