201122222221 has 4 divisors (see below), whose sum is σ = 201126823744. Its totient is φ = 201117620700.

The previous prime is 201122222141. The next prime is 201122222263. The reversal of 201122222221 is 122222221102.

201122222221 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 201122222221 - 2²¹ = 201120125069 is a prime.

It is a super-2 number, since 2×201122222221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201122222321) 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, 2234565 + ... + 2322826.

It is an arithmetic number, because the mean of its divisors is an integer number (50281705936).

Almost surely, 2^201122222221 is an apocalyptic number.

It is an amenable number.

201122222221 is a deficient number, since it is larger than the sum of its proper divisors (4601523).

201122222221 is an equidigital number, since it uses as much as digits as its factorization.

201122222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601522.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 201122222221 its reverse (122222221102), we get a palindrome (323344443323).

The spelling of 201122222221 in words is "two hundred one billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".