21409682 has 8 divisors (see below), whose sum is σ = 36702336. Its totient is φ = 9175572.

The previous prime is 21409669. The next prime is 21409691. The reversal of 21409682 is 28690412.

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

It is a super-2 number, since 2×21409682² = 916748966682248, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764618 + ... + 764645.

It is an arithmetic number, because the mean of its divisors is an integer number (4587792).

Almost surely, 2^21409682 is an apocalyptic number.

21409682 is a deficient number, since it is larger than the sum of its proper divisors (15292654).

21409682 is a wasteful number, since it uses less digits than its factorization.

21409682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529272.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 21409682 is about 4627.0597575566. The cubic root of 21409682 is about 277.6749733824.

The spelling of 21409682 in words is "twenty-one million, four hundred nine thousand, six hundred eighty-two".