221452530452721 has 80 divisors (see below), whose sum is σ = 332887778731200. Its totient is φ = 146712093540480.

The previous prime is 221452530452719. The next prime is 221452530452753. The reversal of 221452530452721 is 127254035254122.

221452530452721 is a `hidden beast` number, since 2 + 2 + 1 + 4 + 5 + 2 + 530 + 45 + 2 + 72 + 1 = 666.

It is not a de Polignac number, because 221452530452721 - 2¹ = 221452530452719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221452530457721) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 12201904555 + ... + 12201922703.

It is an arithmetic number, because the mean of its divisors is an integer number (4161097234140).

Almost surely, 2^{221452530452721} is an apocalyptic number.

It is an amenable number.

221452530452721 is a deficient number, since it is larger than the sum of its proper divisors (111435248278479).

221452530452721 is a wasteful number, since it uses less digits than its factorization.

221452530452721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19916 (or 19907 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 45.

The spelling of 221452530452721 in words is "two hundred twenty-one trillion, four hundred fifty-two billion, five hundred thirty million, four hundred fifty-two thousand, seven hundred twenty-one".