1144212221 has 4 divisors (see below), whose sum is σ = 1158696000. Its totient is φ = 1129728444.

The previous prime is 1144212191. The next prime is 1144212233. The reversal of 1144212221 is 1222124411.

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.

It is a cyclic number.

It is not a de Polignac number, because 1144212221 - 2³⁰ = 70470397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1144212193 and 1144212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144212521) 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, 7241771 + ... + 7241928.

It is an arithmetic number, because the mean of its divisors is an integer number (289674000).

Almost surely, 2^1144212221 is an apocalyptic number.

It is an amenable number.

1144212221 is a deficient number, since it is larger than the sum of its proper divisors (14483779).

1144212221 is an equidigital number, since it uses as much as digits as its factorization.

1144212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14483778.

The product of its digits is 256, while the sum is 20.

The square root of 1144212221 is about 33826.2061277939. The cubic root of 1144212221 is about 1045.9289743715.

Adding to 1144212221 its reverse (1222124411), we get a palindrome (2366336632).

The spelling of 1144212221 in words is "one billion, one hundred forty-four million, two hundred twelve thousand, two hundred twenty-one".