21834879 has 8 divisors (see below), whose sum is σ = 31759872. Its totient is φ = 13233240.

The previous prime is 21834871. The next prime is 21834899. The reversal of 21834879 is 97843812.

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

It is not a de Polignac number, because 21834879 - 2³ = 21834871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21834879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21834871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330799 + ... + 330864.

It is an arithmetic number, because the mean of its divisors is an integer number (3969984).

Almost surely, 2^21834879 is an apocalyptic number.

21834879 is a deficient number, since it is larger than the sum of its proper divisors (9924993).

21834879 is a wasteful number, since it uses less digits than its factorization.

21834879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661677.

The product of its digits is 96768, while the sum is 42.

The square root of 21834879 is about 4672.7806496774. The cubic root of 21834879 is about 279.5011483318.

The spelling of 21834879 in words is "twenty-one million, eight hundred thirty-four thousand, eight hundred seventy-nine".