21634711 has 16 divisors (see below), whose sum is σ = 26588160. Its totient is φ = 17189280.

The previous prime is 21634699. The next prime is 21634729. The reversal of 21634711 is 11743612.

It is a cyclic number.

It is not a de Polignac number, because 21634711 - 2¹⁹ = 21110423 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 (21634741) 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 15 ways as a sum of consecutive naturals, for example, 4521 + ... + 7981.

It is an arithmetic number, because the mean of its divisors is an integer number (1661760).

Almost surely, 2^21634711 is an apocalyptic number.

21634711 is a deficient number, since it is larger than the sum of its proper divisors (4953449).

21634711 is a wasteful number, since it uses less digits than its factorization.

21634711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3534.

The product of its digits is 1008, while the sum is 25.

The square root of 21634711 is about 4651.3128254290. The cubic root of 21634711 is about 278.6444299834.

The spelling of 21634711 in words is "twenty-one million, six hundred thirty-four thousand, seven hundred eleven".