21124634 has 8 divisors (see below), whose sum is σ = 32284980. Its totient is φ = 10362976.

The previous prime is 21124627. The next prime is 21124643. The reversal of 21124634 is 43642112.

It can be written as a sum of positive squares in 2 ways, for example, as 21114025 + 10609 = 4595^2 + 103^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99539 + ... + 99750.

Almost surely, 2^21124634 is an apocalyptic number.

21124634 is a deficient number, since it is larger than the sum of its proper divisors (11160346).

21124634 is a wasteful number, since it uses less digits than its factorization.

21124634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199344.

The product of its digits is 1152, while the sum is 23.

The square root of 21124634 is about 4596.1542619890. The cubic root of 21124634 is about 276.4371442001.

Adding to 21124634 its reverse (43642112), we get a palindrome (64766746).

The spelling of 21124634 in words is "twenty-one million, one hundred twenty-four thousand, six hundred thirty-four".