221121012221201 has 4 divisors (see below), whose sum is σ = 234128130587172. Its totient is φ = 208113893855232.

The previous prime is 221121012221191. The next prime is 221121012221233. The reversal of 221121012221201 is 102122210121122.

221121012221201 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.

It can be written as a sum of positive squares in 2 ways, for example, as 138636471811201 + 82484540410000 = 11774399^2 + 9082100^2 .

It is a cyclic number.

It is not a de Polignac number, because 221121012221201 - 2¹⁴ = 221121012204817 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221121012221801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6503559182960 + ... + 6503559182993.

It is an arithmetic number, because the mean of its divisors is an integer number (58532032646793).

Almost surely, 2^{221121012221201} is an apocalyptic number.

It is an amenable number.

221121012221201 is a deficient number, since it is larger than the sum of its proper divisors (13007118365971).

221121012221201 is a wasteful number, since it uses less digits than its factorization.

221121012221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13007118365970.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221121012221201 its reverse (102122210121122), we get a palindrome (323243222342323).

The spelling of 221121012221201 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, twelve million, two hundred twenty-one thousand, two hundred one".