1244212221 has 32 divisors (see below), whose sum is σ = 1912135680. Its totient is φ = 704937024.

The previous prime is 1244212183. The next prime is 1244212231. The reversal of 1244212221 is 1222124421.

It is not a de Polignac number, because 1244212221 - 2¹⁴ = 1244195837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244212231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1821346 + ... + 1822028.

It is an arithmetic number, because the mean of its divisors is an integer number (59754240).

Almost surely, 2^1244212221 is an apocalyptic number.

It is an amenable number.

1244212221 is a deficient number, since it is larger than the sum of its proper divisors (667923459).

1244212221 is a wasteful number, since it uses less digits than its factorization.

1244212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305.

The product of its digits is 512, while the sum is 21.

The square root of 1244212221 is about 35273.3925360179. The cubic root of 1244212221 is about 1075.5521867665.

Adding to 1244212221 its reverse (1222124421), we get a palindrome (2466336642).

The spelling of 1244212221 in words is "one billion, two hundred forty-four million, two hundred twelve thousand, two hundred twenty-one".