21083826 has 16 divisors (see below), whose sum is σ = 42676704. Its totient is φ = 6943104.

The previous prime is 21083819. The next prime is 21083831. The reversal of 21083826 is 62838012.

It is a junction number, because it is equal to n+sod(n) for n = 21083793 and 21083802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20671 + ... + 21666.

It is an arithmetic number, because the mean of its divisors is an integer number (2667294).

Almost surely, 2^21083826 is an apocalyptic number.

21083826 is an abundant number, since it is smaller than the sum of its proper divisors (21592878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21083826 is a wasteful number, since it uses less digits than its factorization.

21083826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42425.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21083826 is about 4591.7127523398. The cubic root of 21083826 is about 276.2590248411.

The spelling of 21083826 in words is "twenty-one million, eighty-three thousand, eight hundred twenty-six".