1212201101 has 2 divisors, whose sum is σ = 1212201102. Its totient is φ = 1212201100.

The previous prime is 1212201097. The next prime is 1212201103. The reversal of 1212201101 is 1011022121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1193702500 + 18498601 = 34550^2 + 4301^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212201101 - 2² = 1212201097 is a prime.

It is a super-2 number, since 2×1212201101² = 2938863018531224402, which contains 22 as substring.

Together with 1212201103, 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 (1212201103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606100550 + 606100551.

It is an arithmetic number, because the mean of its divisors is an integer number (606100551).

Almost surely, 2^1212201101 is an apocalyptic number.

It is an amenable number.

1212201101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212201101 is an equidigital number, since it uses as much as digits as its factorization.

1212201101 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 1212201101 is about 34816.6784889082. The cubic root of 1212201101 is about 1066.2479881052.

Adding to 1212201101 its reverse (1011022121), we get a palindrome (2223223222).

The spelling of 1212201101 in words is "one billion, two hundred twelve million, two hundred one thousand, one hundred one".