21389682 has 16 divisors (see below), whose sum is σ = 42904800. Its totient is φ = 7108992.

The previous prime is 21389677. The next prime is 21389699. The reversal of 21389682 is 28698312.

It is a happy number.

It is a super-2 number, since 2×21389682² = 915036992122248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21389682.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2932 + ... + 7167.

It is an arithmetic number, because the mean of its divisors is an integer number (2681550).

Almost surely, 2^21389682 is an apocalyptic number.

21389682 is an abundant number, since it is smaller than the sum of its proper divisors (21515118).

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

21389682 is a wasteful number, since it uses less digits than its factorization.

21389682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10457.

The product of its digits is 41472, while the sum is 39.

The square root of 21389682 is about 4624.8980529305. The cubic root of 21389682 is about 277.5884824567.

The spelling of 21389682 in words is "twenty-one million, three hundred eighty-nine thousand, six hundred eighty-two".