221211001222201 has 4 divisors (see below), whose sum is σ = 221294571682432. Its totient is φ = 221127430761972.

The previous prime is 221211001222199. The next prime is 221211001222231. The reversal of 221211001222201 is 102222100112122.

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 221211001222201 - 2¹ = 221211001222199 is a prime.

It is a super-2 number, since 2×221211001222201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221211001222231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41785226145 + ... + 41785231438.

It is an arithmetic number, because the mean of its divisors is an integer number (55323642920608).

Almost surely, 2^{221211001222201} is an apocalyptic number.

It is an amenable number.

221211001222201 is a deficient number, since it is larger than the sum of its proper divisors (83570460231).

221211001222201 is an equidigital number, since it uses as much as digits as its factorization.

221211001222201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83570460230.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221211001222201 its reverse (102222100112122), we get a palindrome (323433101334323).

The spelling of 221211001222201 in words is "two hundred twenty-one trillion, two hundred eleven billion, one million, two hundred twenty-two thousand, two hundred one".