21158119 has 2 divisors, whose sum is σ = 21158120. Its totient is φ = 21158118.

The previous prime is 21158063. The next prime is 21158141. The reversal of 21158119 is 91185112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21158119 - 2¹¹ = 21156071 is a prime.

It is a super-2 number, since 2×21158119² = 895331999236322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21158519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10579059 + 10579060.

It is an arithmetic number, because the mean of its divisors is an integer number (10579060).

Almost surely, 2^21158119 is an apocalyptic number.

21158119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21158119 is an equidigital number, since it uses as much as digits as its factorization.

21158119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 28.

The square root of 21158119 is about 4599.7955389343. The cubic root of 21158119 is about 276.5831287601.

It can be divided in two parts, 211581 and 19, that added together give a square (211600 = 460²).

The spelling of 21158119 in words is "twenty-one million, one hundred fifty-eight thousand, one hundred nineteen".