21833684 has 6 divisors (see below), whose sum is σ = 38208954. Its totient is φ = 10916840.

The previous prime is 21833677. The next prime is 21833699. The reversal of 21833684 is 48633812.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15382084 + 6451600 = 3922^2 + 2540^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2729207 + ... + 2729214.

It is an arithmetic number, because the mean of its divisors is an integer number (6368159).

Almost surely, 2^21833684 is an apocalyptic number.

It is an amenable number.

21833684 is a deficient number, since it is larger than the sum of its proper divisors (16375270).

21833684 is a wasteful number, since it uses less digits than its factorization.

21833684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5458425 (or 5458423 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 21833684 is about 4672.6527797387. The cubic root of 21833684 is about 279.4960493040.

The spelling of 21833684 in words is "twenty-one million, eight hundred thirty-three thousand, six hundred eighty-four".