221211101221101 has 6 divisors (see below), whose sum is σ = 319527146208270. Its totient is φ = 147474067480728.

The previous prime is 221211101221091. The next prime is 221211101221207. The reversal of 221211101221101 is 101122101112122.

It is a happy number.

221211101221101 is a `hidden beast` number, since 221 + 21 + 1 + 101 + 221 + 101 = 666.

221211101221101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 197707502722500 + 23503598498601 = 14060850^2 + 4848051^2 .

It is not a de Polignac number, because 221211101221101 - 2⁷ = 221211101220973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211101221501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12289505623386 + ... + 12289505623403.

It is an arithmetic number, because the mean of its divisors is an integer number (53254524368045).

Almost surely, 2^{221211101221101} is an apocalyptic number.

It is an amenable number.

221211101221101 is a deficient number, since it is larger than the sum of its proper divisors (98316044987169).

221211101221101 is a wasteful number, since it uses less digits than its factorization.

221211101221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24579011246795 (or 24579011246792 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221211101221101 its reverse (101122101112122), we get a palindrome (322333202333223).

The spelling of 221211101221101 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred one million, two hundred twenty-one thousand, one hundred one".