21282946 has 8 divisors (see below), whose sum is σ = 33802380. Its totient is φ = 10015488.

The previous prime is 21282923. The next prime is 21282953. The reversal of 21282946 is 64928212.

21282946 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 2 ways, for example, as 21114025 + 168921 = 4595^2 + 411^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 625969 = 21282946 / (2 + 1 + 2 + 8 + 2 + 9 + 4 + 6).

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, 312951 + ... + 313018.

Almost surely, 2^21282946 is an apocalyptic number.

21282946 is a deficient number, since it is larger than the sum of its proper divisors (12519434).

21282946 is a wasteful number, since it uses less digits than its factorization.

21282946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625988.

The product of its digits is 13824, while the sum is 34.

The square root of 21282946 is about 4613.3443400639. The cubic root of 21282946 is about 277.1259836935.

The spelling of 21282946 in words is "twenty-one million, two hundred eighty-two thousand, nine hundred forty-six".