244240020221 has 4 divisors (see below), whose sum is σ = 258607080252. Its totient is φ = 229872960192.

The previous prime is 244240020191. The next prime is 244240020239. The reversal of 244240020221 is 122020042442.

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 198706435225 + 45533584996 = 445765^2 + 213386^2 .

It is a cyclic number.

It is not a de Polignac number, because 244240020221 - 2¹⁴ = 244240003837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (244240026221) 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, 7183529990 + ... + 7183530023.

It is an arithmetic number, because the mean of its divisors is an integer number (64651770063).

Almost surely, 2^244240020221 is an apocalyptic number.

It is an amenable number.

244240020221 is a deficient number, since it is larger than the sum of its proper divisors (14367060031).

244240020221 is a wasteful number, since it uses less digits than its factorization.

244240020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14367060030.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 244240020221 its reverse (122020042442), we get a palindrome (366260062663).

The spelling of 244240020221 in words is "two hundred forty-four billion, two hundred forty million, twenty thousand, two hundred twenty-one".