1221340444 has 12 divisors (see below), whose sum is σ = 2249837800. Its totient is φ = 578529648.

The previous prime is 1221340433. The next prime is 1221340447. The reversal of 1221340444 is 4440431221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221340447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8035059 + ... + 8035210.

Almost surely, 2^1221340444 is an apocalyptic number.

It is an amenable number.

1221340444 is a deficient number, since it is larger than the sum of its proper divisors (1028497356).

1221340444 is a wasteful number, since it uses less digits than its factorization.

1221340444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16070292 (or 16070290 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 1221340444 is about 34947.6815253888. The cubic root of 1221340444 is about 1068.9209268746.

Adding to 1221340444 its reverse (4440431221), we get a palindrome (5661771665).

The spelling of 1221340444 in words is "one billion, two hundred twenty-one million, three hundred forty thousand, four hundred forty-four".