21812074 has 8 divisors (see below), whose sum is σ = 32741028. Its totient is φ = 10898400.

The previous prime is 21812069. The next prime is 21812081. The reversal of 21812074 is 47021812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15015625 + 6796449 = 3875^2 + 2607^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 934 + ... + 6670.

Almost surely, 2^21812074 is an apocalyptic number.

21812074 is a deficient number, since it is larger than the sum of its proper divisors (10928954).

21812074 is a wasteful number, since it uses less digits than its factorization.

21812074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7640.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 21812074 is about 4670.3398163303. The cubic root of 21812074 is about 279.4038079855.

Adding to 21812074 its reverse (47021812), we get a palindrome (68833886).

The spelling of 21812074 in words is "twenty-one million, eight hundred twelve thousand, seventy-four".