201122001221 has 16 divisors (see below), whose sum is σ = 210922467840. Its totient is φ = 191551011840.

The previous prime is 201122001193. The next prime is 201122001229. The reversal of 201122001221 is 122100221102.

It is a cyclic number.

It is not a de Polignac number, because 201122001221 - 2¹⁰ = 201122000197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201122001196 and 201122001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201122001229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351425 + ... + 725081.

It is an arithmetic number, because the mean of its divisors is an integer number (13182654240).

Almost surely, 2^201122001221 is an apocalyptic number.

It is an amenable number.

201122001221 is a deficient number, since it is larger than the sum of its proper divisors (9800466619).

201122001221 is a wasteful number, since it uses less digits than its factorization.

201122001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373964.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201122001221 its reverse (122100221102), we get a palindrome (323222222323).

The spelling of 201122001221 in words is "two hundred one billion, one hundred twenty-two million, one thousand, two hundred twenty-one".