21842711 has 8 divisors (see below), whose sum is σ = 23877504. Its totient is φ = 19816120.

The previous prime is 21842699. The next prime is 21842719. The reversal of 21842711 is 11724812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21842711 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 (21842719) 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, 4430 + ... + 7956.

It is an arithmetic number, because the mean of its divisors is an integer number (2984688).

Almost surely, 2^21842711 is an apocalyptic number.

21842711 is a deficient number, since it is larger than the sum of its proper divisors (2034793).

21842711 is a wasteful number, since it uses less digits than its factorization.

21842711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4101.

The product of its digits is 896, while the sum is 26.

The square root of 21842711 is about 4673.6186194425. The cubic root of 21842711 is about 279.5345626275.

The spelling of 21842711 in words is "twenty-one million, eight hundred forty-two thousand, seven hundred eleven".