747730221 has 16 divisors (see below), whose sum is σ = 1142131200. Its totient is φ = 426249648.

The previous prime is 747730213. The next prime is 747730267. The reversal of 747730221 is 122037747.

747730221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 747730221 - 2³ = 747730213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (747730211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33691 + ... + 51288.

It is an arithmetic number, because the mean of its divisors is an integer number (71383200).

Almost surely, 2^747730221 is an apocalyptic number.

It is an amenable number.

747730221 is a deficient number, since it is larger than the sum of its proper divisors (394400979).

747730221 is a wasteful number, since it uses less digits than its factorization.

747730221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85408.

The product of its (nonzero) digits is 16464, while the sum is 33.

The square root of 747730221 is about 27344.6561689848. The cubic root of 747730221 is about 907.6428231070.

Adding to 747730221 its reverse (122037747), we get a palindrome (869767968).

The spelling of 747730221 in words is "seven hundred forty-seven million, seven hundred thirty thousand, two hundred twenty-one".