1201211100121 has 16 divisors (see below), whose sum is σ = 1233394159360. Its totient is φ = 1169460789120.

The previous prime is 1201211100097. The next prime is 1201211100139. The reversal of 1201211100121 is 1210011121021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1201211100121 - 2⁹ = 1201211099609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201211100821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24548746 + ... + 24597628.

It is an arithmetic number, because the mean of its divisors is an integer number (77087134960).

Almost surely, 2^{1201211100121} is an apocalyptic number.

It is an amenable number.

1201211100121 is a deficient number, since it is larger than the sum of its proper divisors (32183059239).

1201211100121 is an equidigital number, since it uses as much as digits as its factorization.

1201211100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53296.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1201211100121 its reverse (1210011121021), we get a palindrome (2411222221142).

The spelling of 1201211100121 in words is "one trillion, two hundred one billion, two hundred eleven million, one hundred thousand, one hundred twenty-one".