1221100404044 has 24 divisors (see below), whose sum is σ = 2317813254288. Its totient is φ = 560619983360.

The previous prime is 1221100404037. The next prime is 1221100404049. The reversal of 1221100404044 is 4404040011221.

It is not an unprimeable number, because it can be changed into a prime (1221100404049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218989394 + ... + 218994969.

It is an arithmetic number, because the mean of its divisors is an integer number (96575552262).

Almost surely, 2^{1221100404044} is an apocalyptic number.

It is an amenable number.

1221100404044 is a deficient number, since it is larger than the sum of its proper divisors (1096712850244).

1221100404044 is a wasteful number, since it uses less digits than its factorization.

1221100404044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437984425 (or 437984423 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 1221100404044 its reverse (4404040011221), we get a palindrome (5625140415265).

The spelling of 1221100404044 in words is "one trillion, two hundred twenty-one billion, one hundred million, four hundred four thousand, forty-four".