21712834 has 48 divisors (see below), whose sum is σ = 40037760. Its totient is φ = 8704800.

The previous prime is 21712819. The next prime is 21712843. The reversal of 21712834 is 43821712.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 274807 + ... + 274885.

It is an arithmetic number, because the mean of its divisors is an integer number (834120).

Almost surely, 2^21712834 is an apocalyptic number.

21712834 is a deficient number, since it is larger than the sum of its proper divisors (18324926).

21712834 is a wasteful number, since it uses less digits than its factorization.

21712834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 136 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 21712834 is about 4659.7032094330. The cubic root of 21712834 is about 278.9794223506.

It can be divided in two parts, 2171 and 2834, that added together give a palindrome (5005).

The spelling of 21712834 in words is "twenty-one million, seven hundred twelve thousand, eight hundred thirty-four".