21174331 has 2 divisors, whose sum is σ = 21174332. Its totient is φ = 21174330.

The previous prime is 21174319. The next prime is 21174353. The reversal of 21174331 is 13347112.

It is an a-pointer prime, because the next prime (21174353) can be obtained adding 21174331 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21174331 - 2¹⁷ = 21043259 is a prime.

It is a super-2 number, since 2×21174331² = 896704586595122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21174301) 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, 10587165 + 10587166.

It is an arithmetic number, because the mean of its divisors is an integer number (10587166).

Almost surely, 2^21174331 is an apocalyptic number.

21174331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21174331 is an equidigital number, since it uses as much as digits as its factorization.

21174331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 22.

The square root of 21174331 is about 4601.5574537324. The cubic root of 21174331 is about 276.6537528851.

The spelling of 21174331 in words is "twenty-one million, one hundred seventy-four thousand, three hundred thirty-one".