147201721 has 12 divisors (see below), whose sum is σ = 156321252. Its totient is φ = 138589344.

The previous prime is 147201713. The next prime is 147201731. The reversal of 147201721 is 127102741.

147201721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 83521321 + 63680400 = 9139^2 + 7980^2 .

It is not a de Polignac number, because 147201721 - 2³ = 147201713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (147201701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61275 + ... + 63631.

It is an arithmetic number, because the mean of its divisors is an integer number (13026771).

Almost surely, 2^147201721 is an apocalyptic number.

It is an amenable number.

147201721 is a deficient number, since it is larger than the sum of its proper divisors (9119531).

147201721 is a wasteful number, since it uses less digits than its factorization.

147201721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2568 (or 2549 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 147201721 is about 12132.6716348873. The cubic root of 147201721 is about 528.0045064373.

The spelling of 147201721 in words is "one hundred forty-seven million, two hundred one thousand, seven hundred twenty-one".