21866092 has 24 divisors (see below), whose sum is σ = 39481344. Its totient is φ = 10590672.

The previous prime is 21866081. The next prime is 21866111. The reversal of 21866092 is 29066812.

It is a happy number.

It is a super-3 number, since 3×21866092³ (a number of 23 digits) contains 333 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 7 ways as a sum of consecutive naturals, for example, 19573 + ... + 20659.

It is an arithmetic number, because the mean of its divisors is an integer number (1645056).

Almost surely, 2^21866092 is an apocalyptic number.

It is an amenable number.

21866092 is a deficient number, since it is larger than the sum of its proper divisors (17615252).

21866092 is a wasteful number, since it uses less digits than its factorization.

21866092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245 (or 1243 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 21866092 is about 4676.1193312404. The cubic root of 21866092 is about 279.6342673904.

The spelling of 21866092 in words is "twenty-one million, eight hundred sixty-six thousand, ninety-two".