144211111220221 has 4 divisors (see below), whose sum is σ = 144211186689532. Its totient is φ = 144211035750912.

The previous prime is 144211111220213. The next prime is 144211111220233. The reversal of 144211111220221 is 122022111112441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77517265663321 + 66693845556900 = 8804389^2 + 8166630^2 .

It is a cyclic number.

It is not a de Polignac number, because 144211111220221 - 2³ = 144211111220213 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 (144211111220521) 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, 34791870 + ... + 38715583.

It is an arithmetic number, because the mean of its divisors is an integer number (36052796672383).

Almost surely, 2^{144211111220221} is an apocalyptic number.

It is an amenable number.

144211111220221 is a deficient number, since it is larger than the sum of its proper divisors (75469311).

144211111220221 is an equidigital number, since it uses as much as digits as its factorization.

144211111220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75469310.

The product of its (nonzero) digits is 512, while the sum is 25.

Adding to 144211111220221 its reverse (122022111112441), we get a palindrome (266233222332662).

The spelling of 144211111220221 in words is "one hundred forty-four trillion, two hundred eleven billion, one hundred eleven million, two hundred twenty thousand, two hundred twenty-one".