21689362 has 8 divisors (see below), whose sum is σ = 32561100. Its totient is φ = 10835664.

The previous prime is 21689351. The next prime is 21689383. The reversal of 21689362 is 26398612.

It can be written as a sum of positive squares in 2 ways, for example, as 14830201 + 6859161 = 3851^2 + 2619^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 937 + ... + 6652.

Almost surely, 2^21689362 is an apocalyptic number.

21689362 is a deficient number, since it is larger than the sum of its proper divisors (10871738).

21689362 is a wasteful number, since it uses less digits than its factorization.

21689362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9020.

The product of its digits is 31104, while the sum is 37.

The square root of 21689362 is about 4657.1839130530. The cubic root of 21689362 is about 278.8788586932.

The spelling of 21689362 in words is "twenty-one million, six hundred eighty-nine thousand, three hundred sixty-two".