21042074 has 8 divisors (see below), whose sum is σ = 31643028. Its totient is φ = 10494400.

The previous prime is 21042059. The next prime is 21042089. The reversal of 21042074 is 47024012.

It is an interprime number because it is at equal distance from previous prime (21042059) and next prime (21042089).

It can be written as a sum of positive squares in 2 ways, for example, as 20638849 + 403225 = 4543^2 + 635^2 .

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

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, 12317 + ... + 13920.

Almost surely, 2^21042074 is an apocalyptic number.

21042074 is a deficient number, since it is larger than the sum of its proper divisors (10600954).

21042074 is a wasteful number, since it uses less digits than its factorization.

21042074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26640.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 21042074 is about 4587.1640476443. The cubic root of 21042074 is about 276.0765470661.

Adding to 21042074 its reverse (47024012), we get a palindrome (68066086).

The spelling of 21042074 in words is "twenty-one million, forty-two thousand, seventy-four".