1101231121 has 2 divisors, whose sum is σ = 1101231122. Its totient is φ = 1101231120.

The previous prime is 1101231119. The next prime is 1101231133. The reversal of 1101231121 is 1211321011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 689587600 + 411643521 = 26260^2 + 20289^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101231121 - 2¹ = 1101231119 is a prime.

Together with 1101231119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1101231101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550615560 + 550615561.

It is an arithmetic number, because the mean of its divisors is an integer number (550615561).

Almost surely, 2^1101231121 is an apocalyptic number.

It is an amenable number.

1101231121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101231121 is an equidigital number, since it uses as much as digits as its factorization.

1101231121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1101231121 is about 33184.8025608109. The cubic root of 1101231121 is about 1032.6650814885.

Adding to 1101231121 its reverse (1211321011), we get a palindrome (2312552132).

The spelling of 1101231121 in words is "one billion, one hundred one million, two hundred thirty-one thousand, one hundred twenty-one".