1221444020404 has 12 divisors (see below), whose sum is σ = 2154357958144. Its totient is φ = 605913175224.

The previous prime is 1221444020359. The next prime is 1221444020491. The reversal of 1221444020404 is 4040204441221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1202208174 + ... + 1202209189.

Almost surely, 2^{1221444020404} is an apocalyptic number.

It is an amenable number.

1221444020404 is a deficient number, since it is larger than the sum of its proper divisors (932913937740).

1221444020404 is a wasteful number, since it uses less digits than its factorization.

1221444020404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404417494 (or 2404417492 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 28.

Adding to 1221444020404 its reverse (4040204441221), we get a palindrome (5261648461625).

The spelling of 1221444020404 in words is "one trillion, two hundred twenty-one billion, four hundred forty-four million, twenty thousand, four hundred four".