201221112112221 has 4 divisors (see below), whose sum is σ = 268294816149632. Its totient is φ = 134147408074812.

The previous prime is 201221112112219. The next prime is 201221112112243. The reversal of 201221112112221 is 122211211122102.

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 201221112112221 - 2¹ = 201221112112219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221112112621) 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, 33536852018701 + ... + 33536852018706.

It is an arithmetic number, because the mean of its divisors is an integer number (67073704037408).

Almost surely, 2^{201221112112221} is an apocalyptic number.

It is an amenable number.

201221112112221 is a deficient number, since it is larger than the sum of its proper divisors (67073704037411).

201221112112221 is an equidigital number, since it uses as much as digits as its factorization.

201221112112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67073704037410.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 201221112112221 its reverse (122211211122102), we get a palindrome (323432323234323).

The spelling of 201221112112221 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred twelve thousand, two hundred twenty-one".