21084026 has 8 divisors (see below), whose sum is σ = 31857300. Its totient is φ = 10464928.

The previous prime is 21083989. The next prime is 21084047. The reversal of 21084026 is 62048012.

It can be written as a sum of positive squares in 2 ways, for example, as 20693401 + 390625 = 4549^2 + 625^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21083992 and 21084010.

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, 38201 + ... + 38748.

Almost surely, 2^21084026 is an apocalyptic number.

21084026 is a deficient number, since it is larger than the sum of its proper divisors (10773274).

21084026 is a wasteful number, since it uses less digits than its factorization.

21084026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77088.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21084026 is about 4591.7345306540. The cubic root of 21084026 is about 276.2598983643.

The spelling of 21084026 in words is "twenty-one million, eighty-four thousand, twenty-six".