21283206 has 16 divisors (see below), whose sum is σ = 48647424. Its totient is φ = 6080904.

The previous prime is 21283181. The next prime is 21283217. The reversal of 21283206 is 60238212.

It is a congruent number.

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, 253330 + ... + 253413.

It is an arithmetic number, because the mean of its divisors is an integer number (3040464).

Almost surely, 2^21283206 is an apocalyptic number.

21283206 is an abundant number, since it is smaller than the sum of its proper divisors (27364218).

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

21283206 is a wasteful number, since it uses less digits than its factorization.

21283206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506755.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21283206 is about 4613.3725191014. The cubic root of 21283206 is about 277.1271121786.

The spelling of 21283206 in words is "twenty-one million, two hundred eighty-three thousand, two hundred six".