444140221 has 16 divisors (see below), whose sum is σ = 515418624. Its totient is φ = 374850864.

The previous prime is 444140149. The next prime is 444140231. The reversal of 444140221 is 122041444.

It is a cyclic number.

It is not a de Polignac number, because 444140221 - 2¹⁵ = 444107453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 444140192 and 444140201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444140231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200506 + ... + 202708.

It is an arithmetic number, because the mean of its divisors is an integer number (32213664).

Almost surely, 2^444140221 is an apocalyptic number.

It is an amenable number.

444140221 is a deficient number, since it is larger than the sum of its proper divisors (71278403).

444140221 is a wasteful number, since it uses less digits than its factorization.

444140221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 444140221 is about 21074.6345401290. The cubic root of 444140221 is about 762.9686641693.

Adding to 444140221 its reverse (122041444), we get a palindrome (566181665).

The spelling of 444140221 in words is "four hundred forty-four million, one hundred forty thousand, two hundred twenty-one".