221101211120221 has 4 divisors (see below), whose sum is σ = 221101241679612. Its totient is φ = 221101180560832.

The previous prime is 221101211120173. The next prime is 221101211120239. The reversal of 221101211120221 is 122021112101122.

It is a happy number.

221101211120221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 94043542736025 + 127057668384196 = 9697605^2 + 11271986^2 .

It is a cyclic number.

It is not a de Polignac number, because 221101211120221 - 2¹³ = 221101211112029 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 (221101211120921) 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, 2364651 + ... + 21161143.

It is an arithmetic number, because the mean of its divisors is an integer number (55275310419903).

Almost surely, 2^{221101211120221} is an apocalyptic number.

It is an amenable number.

221101211120221 is a deficient number, since it is larger than the sum of its proper divisors (30559391).

221101211120221 is a wasteful number, since it uses less digits than its factorization.

221101211120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30559390.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221101211120221 its reverse (122021112101122), we get a palindrome (343122323221343).

The spelling of 221101211120221 in words is "two hundred twenty-one trillion, one hundred one billion, two hundred eleven million, one hundred twenty thousand, two hundred twenty-one".