1101220121 has 2 divisors, whose sum is σ = 1101220122. Its totient is φ = 1101220120.

The previous prime is 1101220117. The next prime is 1101220157. The reversal of 1101220121 is 1210221011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 678342025 + 422878096 = 26045^2 + 20564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101220121 - 2² = 1101220117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1101220171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550610060 + 550610061.

It is an arithmetic number, because the mean of its divisors is an integer number (550610061).

Almost surely, 2^1101220121 is an apocalyptic number.

It is an amenable number.

1101220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101220121 is an equidigital number, since it uses as much as digits as its factorization.

1101220121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1101220121 is about 33184.6368218789. The cubic root of 1101220121 is about 1032.6616431083.

Adding to 1101220121 its reverse (1210221011), we get a palindrome (2311441132).

The spelling of 1101220121 in words is "one billion, one hundred one million, two hundred twenty thousand, one hundred twenty-one".