21911834 has 32 divisors (see below), whose sum is σ = 38586240. Its totient is φ = 9139392.

The previous prime is 21911819. The next prime is 21911837. The reversal of 21911834 is 43811912.

It is a junction number, because it is equal to n+sod(n) for n = 21911797 and 21911806.

It is not an unprimeable number, because it can be changed into a prime (21911837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126572 + ... + 126744.

It is an arithmetic number, because the mean of its divisors is an integer number (1205820).

Almost surely, 2^21911834 is an apocalyptic number.

21911834 is a deficient number, since it is larger than the sum of its proper divisors (16674406).

21911834 is a wasteful number, since it uses less digits than its factorization.

21911834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374.

The product of its digits is 1728, while the sum is 29.

The square root of 21911834 is about 4681.0077974727. The cubic root of 21911834 is about 279.8291219284.

The spelling of 21911834 in words is "twenty-one million, nine hundred eleven thousand, eight hundred thirty-four".