21873711 has 8 divisors (see below), whose sum is σ = 29351344. Its totient is φ = 14489280.

The previous prime is 21873707. The next prime is 21873721. The reversal of 21873711 is 11737812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21873711 - 2² = 21873707 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 (21873721) 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, 22750 + ... + 23691.

It is an arithmetic number, because the mean of its divisors is an integer number (3668918).

Almost surely, 2^21873711 is an apocalyptic number.

21873711 is a deficient number, since it is larger than the sum of its proper divisors (7477633).

21873711 is a wasteful number, since it uses less digits than its factorization.

21873711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46601.

The product of its digits is 2352, while the sum is 30.

The square root of 21873711 is about 4676.9339315410. The cubic root of 21873711 is about 279.6667421170. Note that the first 3 decimals are identical.

The spelling of 21873711 in words is "twenty-one million, eight hundred seventy-three thousand, seven hundred eleven".