244420013221 has 4 divisors (see below), whose sum is σ = 244854152352. Its totient is φ = 243985874092.

The previous prime is 244420013213. The next prime is 244420013293. The reversal of 244420013221 is 122310024442.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 244420013221 - 2³ = 244420013213 is a prime.

It is a super-2 number, since 2×244420013221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (244420013521) 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, 217068721 + ... + 217069846.

It is an arithmetic number, because the mean of its divisors is an integer number (61213538088).

Almost surely, 2^244420013221 is an apocalyptic number.

It is an amenable number.

244420013221 is a deficient number, since it is larger than the sum of its proper divisors (434139131).

244420013221 is an equidigital number, since it uses as much as digits as its factorization.

244420013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434139130.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 244420013221 its reverse (122310024442), we get a palindrome (366730037663).

The spelling of 244420013221 in words is "two hundred forty-four billion, four hundred twenty million, thirteen thousand, two hundred twenty-one".