144513221 has 4 divisors (see below), whose sum is σ = 152119200. Its totient is φ = 136907244.

The previous prime is 144513169. The next prime is 144513247. The reversal of 144513221 is 122315441.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122315441 = 149 ⋅820909.

It is a cyclic number.

It is not a de Polignac number, because 144513221 - 2²² = 140318917 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 (144513251) 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, 3802961 + ... + 3802998.

It is an arithmetic number, because the mean of its divisors is an integer number (38029800).

Almost surely, 2^144513221 is an apocalyptic number.

It is an amenable number.

144513221 is a deficient number, since it is larger than the sum of its proper divisors (7605979).

144513221 is an equidigital number, since it uses as much as digits as its factorization.

144513221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7605978.

The product of its digits is 960, while the sum is 23.

The square root of 144513221 is about 12021.3651886963. The cubic root of 144513221 is about 524.7702347569.

Adding to 144513221 its reverse (122315441), we get a palindrome (266828662).

The spelling of 144513221 in words is "one hundred forty-four million, five hundred thirteen thousand, two hundred twenty-one".