1211210120201 has 4 divisors (see below), whose sum is σ = 1211212508052. Its totient is φ = 1211207732352.

The previous prime is 1211210120123. The next prime is 1211210120243. The reversal of 1211210120201 is 1020210121121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 839695489801 + 371514630400 = 916349^2 + 609520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211210120201 - 2¹⁸ = 1211209858057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211210122201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97340 + ... + 1559453.

It is an arithmetic number, because the mean of its divisors is an integer number (302803127013).

Almost surely, 2^{1211210120201} is an apocalyptic number.

It is an amenable number.

1211210120201 is a deficient number, since it is larger than the sum of its proper divisors (2387851).

1211210120201 is an equidigital number, since it uses as much as digits as its factorization.

1211210120201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387850.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211210120201 its reverse (1020210121121), we get a palindrome (2231420241322).

The spelling of 1211210120201 in words is "one trillion, two hundred eleven billion, two hundred ten million, one hundred twenty thousand, two hundred one".