21938876 has 6 divisors (see below), whose sum is σ = 38393040. Its totient is φ = 10969436.

The previous prime is 21938867. The next prime is 21938881. The reversal of 21938876 is 67883912.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2742356 + ... + 2742363.

It is an arithmetic number, because the mean of its divisors is an integer number (6398840).

Almost surely, 2^21938876 is an apocalyptic number.

It is an amenable number.

21938876 is a deficient number, since it is larger than the sum of its proper divisors (16454164).

21938876 is a wasteful number, since it uses less digits than its factorization.

21938876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5484723 (or 5484721 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 21938876 is about 4683.8953873886. The cubic root of 21938876 is about 279.9441895567.

The spelling of 21938876 in words is "twenty-one million, nine hundred thirty-eight thousand, eight hundred seventy-six".