1121220101 has 2 divisors, whose sum is σ = 1121220102. Its totient is φ = 1121220100.

The previous prime is 1121220097. The next prime is 1121220103. The reversal of 1121220101 is 1010221211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 877048225 + 244171876 = 29615^2 + 15626^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121220101 - 2² = 1121220097 is a prime.

Together with 1121220103, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121220103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560610050 + 560610051.

It is an arithmetic number, because the mean of its divisors is an integer number (560610051).

Almost surely, 2^1121220101 is an apocalyptic number.

It is an amenable number.

1121220101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121220101 is an equidigital number, since it uses as much as digits as its factorization.

1121220101 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1121220101 is about 33484.6248448448. The cubic root of 1121220101 is about 1038.8757887098.

Adding to 1121220101 its reverse (1010221211), we get a palindrome (2131441312).

It can be divided in two parts, 11212 and 20101, that added together give a palindrome (31313).

The spelling of 1121220101 in words is "one billion, one hundred twenty-one million, two hundred twenty thousand, one hundred one".