1221414144 has 36 divisors (see below), whose sum is σ = 3250744896. Its totient is φ = 407137792.

The previous prime is 1221414143. The next prime is 1221414179. The reversal of 1221414144 is 4414141221.

It is a super-2 number, since 2×1221414144² = 2983705022326505472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221414143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794424 + ... + 795959.

Almost surely, 2^1221414144 is an apocalyptic number.

It is an amenable number.

1221414144 is an abundant number, since it is smaller than the sum of its proper divisors (2029330752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221414144 is an equidigital number, since it uses as much as digits as its factorization.

1221414144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590402 (or 1590388 counting only the distinct ones).

The product of its digits is 1024, while the sum is 24.

The square root of 1221414144 is about 34948.7359428063. The cubic root of 1221414144 is about 1068.9424272647.

Adding to 1221414144 its reverse (4414141221), we get a palindrome (5635555365).

The spelling of 1221414144 in words is "one billion, two hundred twenty-one million, four hundred fourteen thousand, one hundred forty-four".