21144419 has 2 divisors, whose sum is σ = 21144420. Its totient is φ = 21144418.

The previous prime is 21144373. The next prime is 21144437. The reversal of 21144419 is 91444112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21144419 - 2²⁴ = 4367203 is a prime.

It is a super-2 number, since 2×21144419² = 894172909695122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21144469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572209 + 10572210.

It is an arithmetic number, because the mean of its divisors is an integer number (10572210).

Almost surely, 2^21144419 is an apocalyptic number.

21144419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144419 is an equidigital number, since it uses as much as digits as its factorization.

21144419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 21144419 is about 4598.3061011638. The cubic root of 21144419 is about 276.5234194984.

The spelling of 21144419 in words is "twenty-one million, one hundred forty-four thousand, four hundred nineteen".