221144399 has 24 divisors (see below), whose sum is σ = 266048640. Its totient is φ = 183166704.

The previous prime is 221144393. The next prime is 221144411. The reversal of 221144399 is 993441122.

It is not a de Polignac number, because 221144399 - 2²⁰ = 220095823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221144393) 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, 216512 + ... + 217530.

It is an arithmetic number, because the mean of its divisors is an integer number (11085360).

Almost surely, 2^221144399 is an apocalyptic number.

221144399 is a deficient number, since it is larger than the sum of its proper divisors (44904241).

221144399 is a wasteful number, since it uses less digits than its factorization.

221144399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179 (or 1172 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 221144399 is about 14870.9246181937. The cubic root of 221144399 is about 604.7260093955.

It can be divided in two parts, 2211 and 44399, that multiplied together give a palindrome (98166189).

The spelling of 221144399 in words is "two hundred twenty-one million, one hundred forty-four thousand, three hundred ninety-nine".