221001201121 has 4 divisors (see below), whose sum is σ = 221002807600. Its totient is φ = 220999594644.

The previous prime is 221001201119. The next prime is 221001201149. The reversal of 221001201121 is 121102100122.

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 221001201121 - 2¹ = 221001201119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001201151) 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, 575331 + ... + 879208.

It is an arithmetic number, because the mean of its divisors is an integer number (55250701900).

Almost surely, 2^221001201121 is an apocalyptic number.

It is an amenable number.

221001201121 is a deficient number, since it is larger than the sum of its proper divisors (1606479).

221001201121 is a wasteful number, since it uses less digits than its factorization.

221001201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606478.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221001201121 its reverse (121102100122), we get a palindrome (342103301243).

It can be divided in two parts, 22100 and 1201121, that added together give a palindrome (1223221).

The spelling of 221001201121 in words is "two hundred twenty-one billion, one million, two hundred one thousand, one hundred twenty-one".