21000711 has 8 divisors (see below), whose sum is σ = 28249200. Its totient is φ = 13876352.

The previous prime is 21000709. The next prime is 21000731. The reversal of 21000711 is 11700012.

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

It is a cyclic number.

It is not a de Polignac number, because 21000711 - 2¹ = 21000709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30636 + ... + 31313.

It is an arithmetic number, because the mean of its divisors is an integer number (3531150).

Almost surely, 2^21000711 is an apocalyptic number.

21000711 is a deficient number, since it is larger than the sum of its proper divisors (7248489).

21000711 is a wasteful number, since it uses less digits than its factorization.

21000711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62065.

The product of its (nonzero) digits is 14, while the sum is 12.

The square root of 21000711 is about 4582.6532707592. The cubic root of 21000711 is about 275.8955312460.

Adding to 21000711 its reverse (11700012), we get a palindrome (32700723).

The spelling of 21000711 in words is "twenty-one million, seven hundred eleven", and thus it is an aban number.