221211001121201 has 32 divisors (see below), whose sum is σ = 274825933095168. Its totient is φ = 173374622484480.

The previous prime is 221211001121189. The next prime is 221211001121293. The reversal of 221211001121201 is 102121100112122.

It is a cyclic number.

It is not a de Polignac number, because 221211001121201 - 2¹⁴ = 221211001104817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221211001121201.

It is not an unprimeable number, because it can be changed into a prime (221211001121801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122971421 + ... + 124757333.

It is an arithmetic number, because the mean of its divisors is an integer number (8588310409224).

Almost surely, 2^{221211001121201} is an apocalyptic number.

It is an amenable number.

221211001121201 is a deficient number, since it is larger than the sum of its proper divisors (53614931973967).

221211001121201 is a wasteful number, since it uses less digits than its factorization.

221211001121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798761.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221211001121201 its reverse (102121100112122), we get a palindrome (323332101233323).

The spelling of 221211001121201 in words is "two hundred twenty-one trillion, two hundred eleven billion, one million, one hundred twenty-one thousand, two hundred one".