21876386 has 16 divisors (see below), whose sum is σ = 38211264. Its totient is φ = 9198384.

The previous prime is 21876377. The next prime is 21876389. The reversal of 21876386 is 68367812.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21876389) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14000 + ... + 15483.

It is an arithmetic number, because the mean of its divisors is an integer number (2388204).

Almost surely, 2^21876386 is an apocalyptic number.

21876386 is a deficient number, since it is larger than the sum of its proper divisors (16334878).

21876386 is a wasteful number, since it uses less digits than its factorization.

21876386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29545.

The product of its digits is 96768, while the sum is 41.

The square root of 21876386 is about 4677.2199007530. The cubic root of 21876386 is about 279.6781420732.

The spelling of 21876386 in words is "twenty-one million, eight hundred seventy-six thousand, three hundred eighty-six".