21834396 has 36 divisors (see below), whose sum is σ = 55338192. Its totient is φ = 7258944.

The previous prime is 21834391. The next prime is 21834413. The reversal of 21834396 is 69343812.

21834396 is a `hidden beast` number, since 218 + 3 + 439 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21834396.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21834391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21721 + ... + 22703.

It is an arithmetic number, because the mean of its divisors is an integer number (1537172).

Almost surely, 2^21834396 is an apocalyptic number.

It is an amenable number.

21834396 is an abundant number, since it is smaller than the sum of its proper divisors (33503796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21834396 is a wasteful number, since it uses less digits than its factorization.

21834396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610 (or 1605 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 21834396 is about 4672.7289671026. The cubic root of 21834396 is about 279.4990874082.

The spelling of 21834396 in words is "twenty-one million, eight hundred thirty-four thousand, three hundred ninety-six".