1121100331721 has 2 divisors, whose sum is σ = 1121100331722. Its totient is φ = 1121100331720.

The previous prime is 1121100331711. The next prime is 1121100331727. The reversal of 1121100331721 is 1271330011211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 626054407696 + 495045924025 = 791236^2 + 703595^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121100331721 - 2¹⁸ = 1121100069577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121100331727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560550165860 + 560550165861.

It is an arithmetic number, because the mean of its divisors is an integer number (560550165861).

Almost surely, 2^{1121100331721} is an apocalyptic number.

It is an amenable number.

1121100331721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121100331721 is an equidigital number, since it uses as much as digits as its factorization.

1121100331721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 23.

Adding to 1121100331721 its reverse (1271330011211), we get a palindrome (2392430342932).

The spelling of 1121100331721 in words is "one trillion, one hundred twenty-one billion, one hundred million, three hundred thirty-one thousand, seven hundred twenty-one".