21267834 has 32 divisors (see below), whose sum is σ = 48975360. Its totient is φ = 6031152.

The previous prime is 21267823. The next prime is 21267839. The reversal of 21267834 is 43876212.

It is a junction number, because it is equal to n+sod(n) for n = 21267795 and 21267804.

It is not an unprimeable number, because it can be changed into a prime (21267839) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4017 + ... + 7659.

It is an arithmetic number, because the mean of its divisors is an integer number (1530480).

Almost surely, 2^21267834 is an apocalyptic number.

21267834 is an abundant number, since it is smaller than the sum of its proper divisors (27707526).

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

21267834 is a wasteful number, since it uses less digits than its factorization.

21267834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3794.

The product of its digits is 16128, while the sum is 33.

The square root of 21267834 is about 4611.7061918557. The cubic root of 21267834 is about 277.0603768696.

The spelling of 21267834 in words is "twenty-one million, two hundred sixty-seven thousand, eight hundred thirty-four".