1211121010201 has 2 divisors, whose sum is σ = 1211121010202. Its totient is φ = 1211121010200.

The previous prime is 1211121010199. The next prime is 1211121010217. The reversal of 1211121010201 is 1020101211121.

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., 970382606400 + 240738403801 = 985080^2 + 490651^2 .

It is an emirp because it is prime and its reverse (1020101211121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211121010201 - 2¹ = 1211121010199 is a prime.

Together with 1211121010199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1211121010241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605560505100 + 605560505101.

It is an arithmetic number, because the mean of its divisors is an integer number (605560505101).

Almost surely, 2^{1211121010201} is an apocalyptic number.

It is an amenable number.

1211121010201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211121010201 is an equidigital number, since it uses as much as digits as its factorization.

1211121010201 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 13.

Adding to 1211121010201 its reverse (1020101211121), we get a palindrome (2231222221322).

The spelling of 1211121010201 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, ten thousand, two hundred one".