21249119 has 2 divisors, whose sum is σ = 21249120. Its totient is φ = 21249118.

The previous prime is 21249103. The next prime is 21249127. The reversal of 21249119 is 91194212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21249119 - 2⁴ = 21249103 is a prime.

It is a super-2 number, since 2×21249119² = 903050116552322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21249091 and 21249100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21249149) 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, 10624559 + 10624560.

It is an arithmetic number, because the mean of its divisors is an integer number (10624560).

Almost surely, 2^21249119 is an apocalyptic number.

21249119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21249119 is an equidigital number, since it uses as much as digits as its factorization.

21249119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 29.

The square root of 21249119 is about 4609.6766697893. The cubic root of 21249119 is about 276.9790849896.

The spelling of 21249119 in words is "twenty-one million, two hundred forty-nine thousand, one hundred nineteen".