147521021 has 2 divisors, whose sum is σ = 147521022. Its totient is φ = 147521020.

The previous prime is 147520991. The next prime is 147521039. The reversal of 147521021 is 120125741.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146047225 + 1473796 = 12085^2 + 1214^2 .

It is a cyclic number.

It is not a de Polignac number, because 147521021 - 2¹⁸ = 147258877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147521051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73760510 + 73760511.

It is an arithmetic number, because the mean of its divisors is an integer number (73760511).

Almost surely, 2^147521021 is an apocalyptic number.

It is an amenable number.

147521021 is a deficient number, since it is larger than the sum of its proper divisors (1).

147521021 is an equidigital number, since it uses as much as digits as its factorization.

147521021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 147521021 is about 12145.8231915338. The cubic root of 147521021 is about 528.3860012665.

Adding to 147521021 its reverse (120125741), we get a palindrome (267646762).

The spelling of 147521021 in words is "one hundred forty-seven million, five hundred twenty-one thousand, twenty-one".