21291119 has 2 divisors, whose sum is σ = 21291120. Its totient is φ = 21291118.

The previous prime is 21291113. The next prime is 21291139. The reversal of 21291119 is 91119212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21291119 - 2¹⁶ = 21225583 is a prime.

It is a super-2 number, since 2×21291119² = 906623496544322, 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 (21291113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10645559 + 10645560.

It is an arithmetic number, because the mean of its divisors is an integer number (10645560).

Almost surely, 2^21291119 is an apocalyptic number.

21291119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21291119 is an equidigital number, since it uses as much as digits as its factorization.

21291119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 26.

The square root of 21291119 is about 4614.2300549496. The cubic root of 21291119 is about 277.1614527932.

The spelling of 21291119 in words is "twenty-one million, two hundred ninety-one thousand, one hundred nineteen".