21182159 has 2 divisors, whose sum is σ = 21182160. Its totient is φ = 21182158.

The previous prime is 21182143. The next prime is 21182171. The reversal of 21182159 is 95128112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21182159 - 2⁴ = 21182143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21182659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10591079 + 10591080.

It is an arithmetic number, because the mean of its divisors is an integer number (10591080).

Almost surely, 2^21182159 is an apocalyptic number.

21182159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21182159 is an equidigital number, since it uses as much as digits as its factorization.

21182159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 29.

The square root of 21182159 is about 4602.4079567114. The cubic root of 21182159 is about 276.6878409949.

The spelling of 21182159 in words is "twenty-one million, one hundred eighty-two thousand, one hundred fifty-nine".