21834419 has 4 divisors (see below), whose sum is σ = 22587360. Its totient is φ = 21081480.

The previous prime is 21834413. The next prime is 21834431. The reversal of 21834419 is 91443812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21834419 - 2¹⁶ = 21768883 is a prime.

It is a super-2 number, since 2×21834419² = 953483706135122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21834413) 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 3 ways as a sum of consecutive naturals, for example, 376427 + ... + 376484.

It is an arithmetic number, because the mean of its divisors is an integer number (5646840).

Almost surely, 2^21834419 is an apocalyptic number.

21834419 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21834419 is a deficient number, since it is larger than the sum of its proper divisors (752941).

21834419 is an equidigital number, since it uses as much as digits as its factorization.

21834419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752940.

The product of its digits is 6912, while the sum is 32.

The square root of 21834419 is about 4672.7314281906. The cubic root of 21834419 is about 279.4991855481.

The spelling of 21834419 in words is "twenty-one million, eight hundred thirty-four thousand, four hundred nineteen".