221204121044 has 12 divisors (see below), whose sum is σ = 387426352404. Its totient is φ = 110510877504.

The previous prime is 221204121043. The next prime is 221204121049. The reversal of 221204121044 is 440121402122.

It can be written as a sum of positive squares in 2 ways, for example, as 15803004100 + 205401116944 = 125710^2 + 453212^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221204121041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22790297 + ... + 22800000.

It is an arithmetic number, because the mean of its divisors is an integer number (32285529367).

Almost surely, 2^221204121044 is an apocalyptic number.

It is an amenable number.

221204121044 is a deficient number, since it is larger than the sum of its proper divisors (166222231360).

221204121044 is a wasteful number, since it uses less digits than its factorization.

221204121044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45591514 (or 45591512 counting only the distinct ones).

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

Adding to 221204121044 its reverse (440121402122), we get a palindrome (661325523166).

The spelling of 221204121044 in words is "two hundred twenty-one billion, two hundred four million, one hundred twenty-one thousand, forty-four".