21042674 has 16 divisors (see below), whose sum is σ = 32016600. Its totient is φ = 10371840.

The previous prime is 21042649. The next prime is 21042689. The reversal of 21042674 is 47624012.

It can be written as a sum of positive squares in 4 ways, for example, as 20187049 + 855625 = 4493^2 + 925^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71672 + ... + 71964.

Almost surely, 2^21042674 is an apocalyptic number.

21042674 is a deficient number, since it is larger than the sum of its proper divisors (10973926).

21042674 is a wasteful number, since it uses less digits than its factorization.

21042674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 21042674 is about 4587.2294470628. The cubic root of 21042674 is about 276.0791710843.

Adding to 21042674 its reverse (47624012), we get a palindrome (68666686).

The spelling of 21042674 in words is "twenty-one million, forty-two thousand, six hundred seventy-four".