221221121201 has 4 divisors (see below), whose sum is σ = 221318706672. Its totient is φ = 221123535732.

The previous prime is 221221121197. The next prime is 221221121267. The reversal of 221221121201 is 102121122122.

221221121201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221221121201 - 2² = 221221121197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221221121201.

It is not an unprimeable number, because it can be changed into a prime (221221121701) 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 in 3 ways as a sum of consecutive naturals, for example, 48789335 + ... + 48793868.

It is an arithmetic number, because the mean of its divisors is an integer number (55329676668).

Almost surely, 2^221221121201 is an apocalyptic number.

It is an amenable number.

221221121201 is a deficient number, since it is larger than the sum of its proper divisors (97585471).

221221121201 is an equidigital number, since it uses as much as digits as its factorization.

221221121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97585470.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221221121201 its reverse (102121122122), we get a palindrome (323342243323).

The spelling of 221221121201 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred one".