21174319 has 2 divisors, whose sum is σ = 21174320. Its totient is φ = 21174318.

The previous prime is 21174301. The next prime is 21174331. The reversal of 21174319 is 91347112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21174319 - 2⁹ = 21173807 is a prime.

It is a super-2 number, since 2×21174319² = 896703570227522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21174359) 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, 10587159 + 10587160.

It is an arithmetic number, because the mean of its divisors is an integer number (10587160).

Almost surely, 2^21174319 is an apocalyptic number.

21174319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21174319 is an equidigital number, since it uses as much as digits as its factorization.

21174319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 21174319 is about 4601.5561498258. The cubic root of 21174319 is about 276.6537006230.

The spelling of 21174319 in words is "twenty-one million, one hundred seventy-four thousand, three hundred nineteen".