21124134 has 24 divisors (see below), whose sum is σ = 45854640. Its totient is φ = 7028208.

The previous prime is 21124123. The next prime is 21124141. The reversal of 21124134 is 43142112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15904 + ... + 17180.

It is an arithmetic number, because the mean of its divisors is an integer number (1910610).

Almost surely, 2^21124134 is an apocalyptic number.

21124134 is an abundant number, since it is smaller than the sum of its proper divisors (24730506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21124134 is a wasteful number, since it uses less digits than its factorization.

21124134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204 (or 2201 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21124134 is about 4596.0998683667. The cubic root of 21124134 is about 276.4349631814.

Adding to 21124134 its reverse (43142112), we get a palindrome (64266246).

The spelling of 21124134 in words is "twenty-one million, one hundred twenty-four thousand, one hundred thirty-four".