21835834 has 4 divisors (see below), whose sum is σ = 32753754. Its totient is φ = 10917916.

The previous prime is 21835831. The next prime is 21835843. The reversal of 21835834 is 43853812.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11881809 + 9954025 = 3447^2 + 3155^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21835834.

It is not an unprimeable number, because it can be changed into a prime (21835831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5458957 + ... + 5458960.

Almost surely, 2^21835834 is an apocalyptic number.

21835834 is a deficient number, since it is larger than the sum of its proper divisors (10917920).

21835834 is a wasteful number, since it uses less digits than its factorization.

21835834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10917919.

The product of its digits is 23040, while the sum is 34.

The square root of 21835834 is about 4672.8828361088. The cubic root of 21835834 is about 279.5052231533.

The spelling of 21835834 in words is "twenty-one million, eight hundred thirty-five thousand, eight hundred thirty-four".