21682027 has 2 divisors, whose sum is σ = 21682028. Its totient is φ = 21682026.

The previous prime is 21681991. The next prime is 21682039. The reversal of 21682027 is 72028612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21682027 - 2¹¹ = 21679979 is a prime.

It is a super-2 number, since 2×21682027² = 940220589657458, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21681986 and 21682004.

It is not a weakly prime, because it can be changed into another prime (21682057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10841013 + 10841014.

It is an arithmetic number, because the mean of its divisors is an integer number (10841014).

Almost surely, 2^21682027 is an apocalyptic number.

21682027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21682027 is an equidigital number, since it uses as much as digits as its factorization.

21682027 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21682027 is about 4656.3963534046. The cubic root of 21682027 is about 278.8474176721.

The spelling of 21682027 in words is "twenty-one million, six hundred eighty-two thousand, twenty-seven".