20311144404121 has 4 divisors (see below), whose sum is σ = 20311345898532. Its totient is φ = 20310942909712.

The previous prime is 20311144404119. The next prime is 20311144404127. The reversal of 20311144404121 is 12140444111302.

It is a happy number.

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 4758658659225 + 15552485744896 = 2181435^2 + 3943664^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311144404121 - 2¹ = 20311144404119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20311144404121.

It is not an unprimeable number, because it can be changed into a prime (20311144404127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100595926 + ... + 100797631.

It is an arithmetic number, because the mean of its divisors is an integer number (5077836474633).

Almost surely, 2^{20311144404121} is an apocalyptic number.

It is an amenable number.

20311144404121 is a deficient number, since it is larger than the sum of its proper divisors (201494411).

20311144404121 is a wasteful number, since it uses less digits than its factorization.

20311144404121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201494410.

The product of its (nonzero) digits is 3072, while the sum is 28.

Adding to 20311144404121 its reverse (12140444111302), we get a palindrome (32451588515423).

The spelling of 20311144404121 in words is "twenty trillion, three hundred eleven billion, one hundred forty-four million, four hundred four thousand, one hundred twenty-one".