201221011122321 has 4 divisors (see below), whose sum is σ = 268294681496432. Its totient is φ = 134147340748212.

The previous prime is 201221011122317. The next prime is 201221011122349. The reversal of 201221011122321 is 123221110122102.

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 not a de Polignac number, because 201221011122321 - 2² = 201221011122317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201221011122301) 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, 33536835187051 + ... + 33536835187056.

It is an arithmetic number, because the mean of its divisors is an integer number (67073670374108).

Almost surely, 2^{201221011122321} is an apocalyptic number.

It is an amenable number.

201221011122321 is a deficient number, since it is larger than the sum of its proper divisors (67073670374111).

201221011122321 is an equidigital number, since it uses as much as digits as its factorization.

201221011122321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67073670374110.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 201221011122321 its reverse (123221110122102), we get a palindrome (324442121244423).

The spelling of 201221011122321 in words is "two hundred one trillion, two hundred twenty-one billion, eleven million, one hundred twenty-two thousand, three hundred twenty-one".