21873935 has 4 divisors (see below), whose sum is σ = 26248728. Its totient is φ = 17499144.

The previous prime is 21873931. The next prime is 21873937. The reversal of 21873935 is 53937812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21873935 - 2² = 21873931 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21873931) 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 3 ways as a sum of consecutive naturals, for example, 2187389 + ... + 2187398.

It is an arithmetic number, because the mean of its divisors is an integer number (6562182).

Almost surely, 2^21873935 is an apocalyptic number.

21873935 is a deficient number, since it is larger than the sum of its proper divisors (4374793).

21873935 is an equidigital number, since it uses as much as digits as its factorization.

21873935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4374792.

The product of its digits is 45360, while the sum is 38.

The square root of 21873935 is about 4676.9578787926. The cubic root of 21873935 is about 279.6676967658.

The spelling of 21873935 in words is "twenty-one million, eight hundred seventy-three thousand, nine hundred thirty-five".