1221432444 has 36 divisors (see below), whose sum is σ = 3100450080. Its totient is φ = 405437760.

The previous prime is 1221432437. The next prime is 1221432451. The reversal of 1221432444 is 4442341221.

1221432444 is a `hidden beast` number, since 1 + 2 + 214 + 3 + 2 + 444 = 666.

It is an interprime number because it is at equal distance from previous prime (1221432437) and next prime (1221432451).

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62377 + ... + 79584.

Almost surely, 2^1221432444 is an apocalyptic number.

It is an amenable number.

1221432444 is an abundant number, since it is smaller than the sum of its proper divisors (1879017636).

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

1221432444 is a wasteful number, since it uses less digits than its factorization.

1221432444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142210 (or 142205 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

The square root of 1221432444 is about 34948.9977538699. The cubic root of 1221432444 is about 1068.9477657621.

Adding to 1221432444 its reverse (4442341221), we get a palindrome (5663773665).

The spelling of 1221432444 in words is "one billion, two hundred twenty-one million, four hundred thirty-two thousand, four hundred forty-four".