1221204444 has 48 divisors (see below), whose sum is σ = 2931763968. Its totient is φ = 395480448.

The previous prime is 1221204407. The next prime is 1221204449. The reversal of 1221204444 is 4444021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221204449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48289 + ... + 69095.

It is an arithmetic number, because the mean of its divisors is an integer number (61078416).

Almost surely, 2^1221204444 is an apocalyptic number.

It is an amenable number.

1221204444 is an abundant number, since it is smaller than the sum of its proper divisors (1710559524).

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

1221204444 is a wasteful number, since it uses less digits than its factorization.

1221204444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20954 (or 20952 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

The square root of 1221204444 is about 34945.7357055192. The cubic root of 1221204444 is about 1068.8812495286.

Adding to 1221204444 its reverse (4444021221), we get a palindrome (5665225665).

The spelling of 1221204444 in words is "one billion, two hundred twenty-one million, two hundred four thousand, four hundred forty-four".