21734685 has 36 divisors (see below), whose sum is σ = 43828668. Its totient is φ = 9934848.

The previous prime is 21734681. The next prime is 21734707. The reversal of 21734685 is 58643712.

It can be written as a sum of positive squares in 2 ways, for example, as 7918596 + 13816089 = 2814^2 + 3717^2 .

It is not a de Polignac number, because 21734685 - 2² = 21734681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734681) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 2724 + ... + 7133.

It is an arithmetic number, because the mean of its divisors is an integer number (1217463).

Almost surely, 2^21734685 is an apocalyptic number.

It is an amenable number.

21734685 is an abundant number, since it is smaller than the sum of its proper divisors (22093983).

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

21734685 is a wasteful number, since it uses less digits than its factorization.

21734685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9882 (or 9872 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 21734685 is about 4662.0472970574. The cubic root of 21734685 is about 279.0729758619.

The spelling of 21734685 in words is "twenty-one million, seven hundred thirty-four thousand, six hundred eighty-five".