21704683 has 16 divisors (see below), whose sum is σ = 29143296. Its totient is φ = 15611040.

The previous prime is 21704677. The next prime is 21704689. The reversal of 21704683 is 38640712.

It is an interprime number because it is at equal distance from previous prime (21704677) and next prime (21704689).

It is a cyclic number.

It is not a de Polignac number, because 21704683 - 2⁹ = 21704171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21704689) 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, 9841 + ... + 11842.

It is an arithmetic number, because the mean of its divisors is an integer number (1821456).

Almost surely, 2^21704683 is an apocalyptic number.

21704683 is a deficient number, since it is larger than the sum of its proper divisors (7438613).

21704683 is a wasteful number, since it uses less digits than its factorization.

21704683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21714.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21704683 is about 4658.8285008143. The cubic root of 21704683 is about 278.9445083473.

The spelling of 21704683 in words is "twenty-one million, seven hundred four thousand, six hundred eighty-three".