221144401 has 16 divisors (see below), whose sum is σ = 241862400. Its totient is φ = 201398400.

The previous prime is 221144393. The next prime is 221144411. The reversal of 221144401 is 104441122.

221144401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 221144401 - 2³ = 221144393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (221144411) 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, 148581 + ... + 150061.

It is an arithmetic number, because the mean of its divisors is an integer number (15116400).

Almost surely, 2^221144401 is an apocalyptic number.

It is an amenable number.

221144401 is a deficient number, since it is larger than the sum of its proper divisors (20717999).

221144401 is a wasteful number, since it uses less digits than its factorization.

221144401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 221144401 is about 14870.9246854390. The cubic root of 221144401 is about 604.7260112185.

Adding to 221144401 its reverse (104441122), we get a palindrome (325585523).

The spelling of 221144401 in words is "two hundred twenty-one million, one hundred forty-four thousand, four hundred one".