1131204400021 has 2 divisors, whose sum is σ = 1131204400022. Its totient is φ = 1131204400020.

The previous prime is 1131204399973. The next prime is 1131204400057. The reversal of 1131204400021 is 1200044021311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1127926837521 + 3277562500 = 1062039^2 + 57250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131204400021 - 2⁹ = 1131204399509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131204400421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565602200010 + 565602200011.

It is an arithmetic number, because the mean of its divisors is an integer number (565602200011).

Almost surely, 2^{1131204400021} is an apocalyptic number.

It is an amenable number.

1131204400021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131204400021 is an equidigital number, since it uses as much as digits as its factorization.

1131204400021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1131204400021 its reverse (1200044021311), we get a palindrome (2331248421332).

The spelling of 1131204400021 in words is "one trillion, one hundred thirty-one billion, two hundred four million, four hundred thousand, twenty-one".