21042574 has 16 divisors (see below), whose sum is σ = 37317600. Its totient is φ = 8707104.

The previous prime is 21042563. The next prime is 21042577. The reversal of 21042574 is 47524012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042577) 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, 25509 + ... + 26320.

It is an arithmetic number, because the mean of its divisors is an integer number (2332350).

Almost surely, 2^21042574 is an apocalyptic number.

21042574 is a deficient number, since it is larger than the sum of its proper divisors (16275026).

21042574 is a wasteful number, since it uses less digits than its factorization.

21042574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51867.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 21042574 is about 4587.2185472245. The cubic root of 21042574 is about 276.0787337514.

Adding to 21042574 its reverse (47524012), we get a palindrome (68566586).

The spelling of 21042574 in words is "twenty-one million, forty-two thousand, five hundred seventy-four".