1210201121 has 2 divisors, whose sum is σ = 1210201122. Its totient is φ = 1210201120.

The previous prime is 1210201103. The next prime is 1210201123. The reversal of 1210201121 is 1211020121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1153349521 + 56851600 = 33961^2 + 7540^2 .

It is an emirp because it is prime and its reverse (1211020121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210201121 is a prime.

It is a super-3 number, since 3×1210201121³ (a number of 28 digits) contains 333 as substring.

Together with 1210201123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1210201123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605100560 + 605100561.

It is an arithmetic number, because the mean of its divisors is an integer number (605100561).

Almost surely, 2^1210201121 is an apocalyptic number.

It is an amenable number.

1210201121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210201121 is an equidigital number, since it uses as much as digits as its factorization.

1210201121 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 1210201121 is about 34787.9450528484. The cubic root of 1210201121 is about 1065.6612734372.

Adding to 1210201121 its reverse (1211020121), we get a palindrome (2421221242).

The spelling of 1210201121 in words is "one billion, two hundred ten million, two hundred one thousand, one hundred twenty-one".