144321221 has 4 divisors (see below), whose sum is σ = 157441344. Its totient is φ = 131201100.

The previous prime is 144321217. The next prime is 144321239. The reversal of 144321221 is 122123441.

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: 122123441 = 11 ⋅11102131.

It is a cyclic number.

It is not a de Polignac number, because 144321221 - 2² = 144321217 is a prime.

It is a super-3 number, since 3×144321221³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 144321193 and 144321202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144321241) 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, 6560045 + ... + 6560066.

It is an arithmetic number, because the mean of its divisors is an integer number (39360336).

Almost surely, 2^144321221 is an apocalyptic number.

144321221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

144321221 is a deficient number, since it is larger than the sum of its proper divisors (13120123).

144321221 is a wasteful number, since it uses less digits than its factorization.

144321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13120122.

The product of its digits is 384, while the sum is 20.

The square root of 144321221 is about 12013.3767526037. The cubic root of 144321221 is about 524.5377288342.

Adding to 144321221 its reverse (122123441), we get a palindrome (266444662).

The spelling of 144321221 in words is "one hundred forty-four million, three hundred twenty-one thousand, two hundred twenty-one".