148340021 has 2 divisors, whose sum is σ = 148340022. Its totient is φ = 148340020.

The previous prime is 148339999. The next prime is 148340039. The reversal of 148340021 is 120043841.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137217796 + 11122225 = 11714^2 + 3335^2 .

It is an emirp because it is prime and its reverse (120043841) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 148340021 - 2⁶ = 148339957 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 (148340081) 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, 74170010 + 74170011.

It is an arithmetic number, because the mean of its divisors is an integer number (74170011).

Almost surely, 2^148340021 is an apocalyptic number.

It is an amenable number.

148340021 is a deficient number, since it is larger than the sum of its proper divisors (1).

148340021 is an equidigital number, since it uses as much as digits as its factorization.

148340021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 148340021 is about 12179.4918202690. The cubic root of 148340021 is about 529.3620198172.

Adding to 148340021 its reverse (120043841), we get a palindrome (268383862).

The spelling of 148340021 in words is "one hundred forty-eight million, three hundred forty thousand, twenty-one".