21283076 has 12 divisors (see below), whose sum is σ = 37353372. Its totient is φ = 10610688.

The previous prime is 21283039. The next prime is 21283091. The reversal of 21283076 is 67038212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9449476 + 11833600 = 3074^2 + 3440^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6125 + ... + 8948.

It is an arithmetic number, because the mean of its divisors is an integer number (3112781).

Almost surely, 2^21283076 is an apocalyptic number.

It is an amenable number.

21283076 is a deficient number, since it is larger than the sum of its proper divisors (16070296).

21283076 is a wasteful number, since it uses less digits than its factorization.

21283076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15430 (or 15428 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21283076 is about 4613.3584296042. The cubic root of 21283076 is about 277.1265479372.

The spelling of 21283076 in words is "twenty-one million, two hundred eighty-three thousand, seventy-six".