147968021 has 2 divisors, whose sum is σ = 147968022. Its totient is φ = 147968020.

The previous prime is 147967999. The next prime is 147968099. The reversal of 147968021 is 120869741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145684900 + 2283121 = 12070^2 + 1511^2 .

It is an emirp because it is prime and its reverse (120869741) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 147968021 - 2⁶ = 147967957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147968621) 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, 73984010 + 73984011.

It is an arithmetic number, because the mean of its divisors is an integer number (73984011).

Almost surely, 2^147968021 is an apocalyptic number.

It is an amenable number.

147968021 is a deficient number, since it is larger than the sum of its proper divisors (1).

147968021 is an equidigital number, since it uses as much as digits as its factorization.

147968021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 147968021 is about 12164.2106607868. The cubic root of 147968021 is about 528.9191464985.

The spelling of 147968021 in words is "one hundred forty-seven million, nine hundred sixty-eight thousand, twenty-one".