21835005 has 16 divisors (see below), whose sum is σ = 36063744. Its totient is φ = 11269440.

The previous prime is 21834997. The next prime is 21835007. The reversal of 21835005 is 50053812.

It is not a de Polignac number, because 21835005 - 2³ = 21834997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21835007) 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, 23014 + ... + 23943.

It is an arithmetic number, because the mean of its divisors is an integer number (2253984).

Almost surely, 2^21835005 is an apocalyptic number.

It is an amenable number.

21835005 is a deficient number, since it is larger than the sum of its proper divisors (14228739).

21835005 is a wasteful number, since it uses less digits than its factorization.

21835005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46996.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 21835005 is about 4672.7941319943. The cubic root of 21835005 is about 279.5016859590.

Adding to 21835005 its reverse (50053812), we get a palindrome (71888817).

The spelling of 21835005 in words is "twenty-one million, eight hundred thirty-five thousand, five".