21704677 has 2 divisors, whose sum is σ = 21704678. Its totient is φ = 21704676.

The previous prime is 21704671. The next prime is 21704689. The reversal of 21704677 is 77640712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18610596 + 3094081 = 4314^2 + 1759^2 .

It is a cyclic number.

It is not a de Polignac number, because 21704677 - 2⁷ = 21704549 is a prime.

It is a super-3 number, since 3×21704677³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21704671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10852338 + 10852339.

It is an arithmetic number, because the mean of its divisors is an integer number (10852339).

Almost surely, 2^21704677 is an apocalyptic number.

It is an amenable number.

21704677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21704677 is an equidigital number, since it uses as much as digits as its factorization.

21704677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 21704677 is about 4658.8278568756. The cubic root of 21704677 is about 278.9444826436.

The spelling of 21704677 in words is "twenty-one million, seven hundred four thousand, six hundred seventy-seven".