211221022201221 has 4 divisors (see below), whose sum is σ = 281628029601632. Its totient is φ = 140814014800812.

The previous prime is 211221022201193. The next prime is 211221022201253. The reversal of 211221022201221 is 122102220122112.

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 211221022201221 - 2³⁰ = 211219948459397 is a prime.

It is a super-2 number, since 2×211221022201221² (a number of 29 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 (211221022201421) 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, 35203503700201 + ... + 35203503700206.

It is an arithmetic number, because the mean of its divisors is an integer number (70407007400408).

Almost surely, 2^{211221022201221} is an apocalyptic number.

It is an amenable number.

211221022201221 is a deficient number, since it is larger than the sum of its proper divisors (70407007400411).

211221022201221 is an equidigital number, since it uses as much as digits as its factorization.

211221022201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70407007400410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 211221022201221 its reverse (122102220122112), we get a palindrome (333323242323333).

The spelling of 211221022201221 in words is "two hundred eleven trillion, two hundred twenty-one billion, twenty-two million, two hundred one thousand, two hundred twenty-one".