1121131196821 has 2 divisors, whose sum is σ = 1121131196822. Its totient is φ = 1121131196820.

The previous prime is 1121131196819. The next prime is 1121131196837. The reversal of 1121131196821 is 1286911311211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1100600319025 + 20530877796 = 1049095^2 + 143286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121131196821 - 2¹ = 1121131196819 is a prime.

Together with 1121131196819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121131196851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560565598410 + 560565598411.

It is an arithmetic number, because the mean of its divisors is an integer number (560565598411).

Almost surely, 2^{1121131196821} is an apocalyptic number.

It is an amenable number.

1121131196821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121131196821 is an equidigital number, since it uses as much as digits as its factorization.

1121131196821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 37.

The spelling of 1121131196821 in words is "one trillion, one hundred twenty-one billion, one hundred thirty-one million, one hundred ninety-six thousand, eight hundred twenty-one".