21834402 has 8 divisors (see below), whose sum is σ = 43668816. Its totient is φ = 7278132.

The previous prime is 21834391. The next prime is 21834413. The reversal of 21834402 is 20443812.

It is an interprime number because it is at equal distance from previous prime (21834391) and next prime (21834413).

It is a sphenic number, since it is the product of 3 distinct primes.

21834402 is an admirable number.

It is a super-2 number, since 2×21834402² = 953482221395208, which contains 22 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1819528 + ... + 1819539.

It is an arithmetic number, because the mean of its divisors is an integer number (5458602).

Almost surely, 2^21834402 is an apocalyptic number.

21834402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21834402 is a wasteful number, since it uses less digits than its factorization.

21834402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639072.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 21834402 is about 4672.7296091257. The cubic root of 21834402 is about 279.4991130099.

The spelling of 21834402 in words is "twenty-one million, eight hundred thirty-four thousand, four hundred two".