21126874 has 8 divisors (see below), whose sum is σ = 31792500. Its totient is φ = 10529376.

The previous prime is 21126851. The next prime is 21126887. The reversal of 21126874 is 47862112.

It can be written as a sum of positive squares in 2 ways, for example, as 20930625 + 196249 = 4575^2 + 443^2 .

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, 16249 + ... + 17500.

Almost surely, 2^21126874 is an apocalyptic number.

21126874 is a deficient number, since it is larger than the sum of its proper divisors (10665626).

21126874 is a wasteful number, since it uses less digits than its factorization.

21126874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34064.

The product of its digits is 5376, while the sum is 31.

The square root of 21126874 is about 4596.3979375159. The cubic root of 21126874 is about 276.4469147413.

Adding to 21126874 its reverse (47862112), we get a palindrome (68988986).

The spelling of 21126874 in words is "twenty-one million, one hundred twenty-six thousand, eight hundred seventy-four".