21682163 has 2 divisors, whose sum is σ = 21682164. Its totient is φ = 21682162.

The previous prime is 21682151. The next prime is 21682187. The reversal of 21682163 is 36128612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21682163 - 2⁶ = 21682099 is a prime.

It is not a weakly prime, because it can be changed into another prime (21682663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10841081 + 10841082.

It is an arithmetic number, because the mean of its divisors is an integer number (10841082).

Almost surely, 2^21682163 is an apocalyptic number.

21682163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21682163 is an equidigital number, since it uses as much as digits as its factorization.

21682163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 21682163 is about 4656.4109569496. The cubic root of 21682163 is about 278.8480006922.

The spelling of 21682163 in words is "twenty-one million, six hundred eighty-two thousand, one hundred sixty-three".