21426682 has 8 divisors (see below), whose sum is σ = 32924052. Its totient is φ = 10452000.

The previous prime is 21426659. The next prime is 21426683. The reversal of 21426682 is 28662412.

It can be written as a sum of positive squares in 2 ways, for example, as 19633761 + 1792921 = 4431^2 + 1339^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21426683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130569 + ... + 130732.

Almost surely, 2^21426682 is an apocalyptic number.

21426682 is a deficient number, since it is larger than the sum of its proper divisors (11497370).

21426682 is a wasteful number, since it uses less digits than its factorization.

21426682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261344.

The product of its digits is 9216, while the sum is 31.

The square root of 21426682 is about 4628.8964127533. The cubic root of 21426682 is about 277.7484483285.

It can be divided in two parts, 214 and 26682, that added together give a square (26896 = 164²).

The spelling of 21426682 in words is "twenty-one million, four hundred twenty-six thousand, six hundred eighty-two".