174040021 has 2 divisors, whose sum is σ = 174040022. Its totient is φ = 174040020.

The previous prime is 174040003. The next prime is 174040037. The reversal of 174040021 is 120040471.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173211921 + 828100 = 13161^2 + 910^2 .

It is an emirp because it is prime and its reverse (120040471) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 174040021 - 2¹³ = 174031829 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (174040091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 87020010 + 87020011.

It is an arithmetic number, because the mean of its divisors is an integer number (87020011).

Almost surely, 2^174040021 is an apocalyptic number.

It is an amenable number.

174040021 is a deficient number, since it is larger than the sum of its proper divisors (1).

174040021 is an equidigital number, since it uses as much as digits as its factorization.

174040021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 174040021 is about 13192.4228631438. The cubic root of 174040021 is about 558.3198161921.

Adding to 174040021 its reverse (120040471), we get a palindrome (294080492).

The spelling of 174040021 in words is "one hundred seventy-four million, forty thousand, twenty-one".