21710711 has 16 divisors (see below), whose sum is σ = 25290240. Its totient is φ = 18429120.

The previous prime is 21710687. The next prime is 21710723. The reversal of 21710711 is 11701712.

It is a cyclic number.

It is not a de Polignac number, because 21710711 - 2¹⁰ = 21709687 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 (21710791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14546 + ... + 15968.

It is an arithmetic number, because the mean of its divisors is an integer number (1580640).

Almost surely, 2^21710711 is an apocalyptic number.

21710711 is a deficient number, since it is larger than the sum of its proper divisors (3579529).

21710711 is a wasteful number, since it uses less digits than its factorization.

21710711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526.

The product of its (nonzero) digits is 98, while the sum is 20.

The square root of 21710711 is about 4659.4753996561. The cubic root of 21710711 is about 278.9703295315.

The spelling of 21710711 in words is "twenty-one million, seven hundred ten thousand, seven hundred eleven".