21886090 has 8 divisors (see below), whose sum is σ = 39394980. Its totient is φ = 8754432.

The previous prime is 21886063. The next prime is 21886103. The reversal of 21886090 is 9068812.

It can be written as a sum of positive squares in 2 ways, for example, as 20331081 + 1555009 = 4509^2 + 1247^2 .

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094295 + ... + 1094314.

Almost surely, 2^21886090 is an apocalyptic number.

21886090 is a deficient number, since it is larger than the sum of its proper divisors (17508890).

21886090 is a wasteful number, since it uses less digits than its factorization.

21886090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188616.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 21886090 is about 4678.2571541120. The cubic root of 21886090 is about 279.7194894800.

The spelling of 21886090 in words is "twenty-one million, eight hundred eighty-six thousand, ninety".