221244144121 has 24 divisors (see below), whose sum is σ = 299305506752. Its totient is φ = 159136639200.

The previous prime is 221244144113. The next prime is 221244144137. The reversal of 221244144121 is 121441442122.

It is not a de Polignac number, because 221244144121 - 2³ = 221244144113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221244144121.

It is not an unprimeable number, because it can be changed into a prime (221244144101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10035495 + ... + 10057516.

Almost surely, 2^221244144121 is an apocalyptic number.

It is an amenable number.

221244144121 is a deficient number, since it is larger than the sum of its proper divisors (78061362631).

221244144121 is a wasteful number, since it uses less digits than its factorization.

221244144121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20093053 (or 20093042 counting only the distinct ones).

The product of its digits is 4096, while the sum is 28.

Adding to 221244144121 its reverse (121441442122), we get a palindrome (342685586243).

The spelling of 221244144121 in words is "two hundred twenty-one billion, two hundred forty-four million, one hundred forty-four thousand, one hundred twenty-one".