21894834 has 16 divisors (see below), whose sum is σ = 47158272. Its totient is φ = 6736848.

The previous prime is 21894751. The next prime is 21894839. The reversal of 21894834 is 43849812.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 21894792 and 21894801.

It is not an unprimeable number, because it can be changed into a prime (21894839) 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, 140274 + ... + 140429.

It is an arithmetic number, because the mean of its divisors is an integer number (2947392).

Almost surely, 2^21894834 is an apocalyptic number.

21894834 is an abundant number, since it is smaller than the sum of its proper divisors (25263438).

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

21894834 is a wasteful number, since it uses less digits than its factorization.

21894834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280721.

The product of its digits is 55296, while the sum is 39.

The square root of 21894834 is about 4679.1915968466. The cubic root of 21894834 is about 279.7567359923.

The spelling of 21894834 in words is "twenty-one million, eight hundred ninety-four thousand, eight hundred thirty-four".