242520201221 has 4 divisors (see below), whose sum is σ = 249074801292. Its totient is φ = 235965601152.

The previous prime is 242520201181. The next prime is 242520201277. The reversal of 242520201221 is 122102025242.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119449036996 + 123071164225 = 345614^2 + 350815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242520201221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242520251221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3277299980 + ... + 3277300053.

It is an arithmetic number, because the mean of its divisors is an integer number (62268700323).

Almost surely, 2^242520201221 is an apocalyptic number.

It is an amenable number.

242520201221 is a deficient number, since it is larger than the sum of its proper divisors (6554600071).

242520201221 is an equidigital number, since it uses as much as digits as its factorization.

242520201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6554600070.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 242520201221 its reverse (122102025242), we get a palindrome (364622226463).

The spelling of 242520201221 in words is "two hundred forty-two billion, five hundred twenty million, two hundred one thousand, two hundred twenty-one".