20444401121 has 4 divisors (see below), whose sum is σ = 21149380500. Its totient is φ = 19739421744.

The previous prime is 20444401099. The next prime is 20444401123. The reversal of 20444401121 is 12110444402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11085773521 + 9358627600 = 105289^2 + 96740^2 .

It is a cyclic number.

It is not a de Polignac number, because 20444401121 - 2⁶ = 20444401057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20444401123) 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, 352489646 + ... + 352489703.

It is an arithmetic number, because the mean of its divisors is an integer number (5287345125).

Almost surely, 2^20444401121 is an apocalyptic number.

It is an amenable number.

20444401121 is a deficient number, since it is larger than the sum of its proper divisors (704979379).

20444401121 is an equidigital number, since it uses as much as digits as its factorization.

20444401121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704979378.

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

Adding to 20444401121 its reverse (12110444402), we get a palindrome (32554845523).

The spelling of 20444401121 in words is "twenty billion, four hundred forty-four million, four hundred one thousand, one hundred twenty-one".