20440311121 has 4 divisors (see below), whose sum is σ = 20462126692. Its totient is φ = 20418495552.

The previous prime is 20440311107. The next prime is 20440311127. The reversal of 20440311121 is 12111304402.

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 7367818896 + 13072492225 = 85836^2 + 114335^2 .

It is a cyclic number.

It is not a de Polignac number, because 20440311121 - 2⁷ = 20440310993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20440311127) 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, 10906380 + ... + 10908253.

It is an arithmetic number, because the mean of its divisors is an integer number (5115531673).

Almost surely, 2^20440311121 is an apocalyptic number.

It is an amenable number.

20440311121 is a deficient number, since it is larger than the sum of its proper divisors (21815571).

20440311121 is an equidigital number, since it uses as much as digits as its factorization.

20440311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21815570.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20440311121 its reverse (12111304402), we get a palindrome (32551615523).

The spelling of 20440311121 in words is "twenty billion, four hundred forty million, three hundred eleven thousand, one hundred twenty-one".