1201021011121 has 4 divisors (see below), whose sum is σ = 1203216662512. Its totient is φ = 1198825359732.

The previous prime is 1201021011109. The next prime is 1201021011139. The reversal of 1201021011121 is 1211101201021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201021011121 - 2¹⁹ = 1201020486833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201021011161) 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, 1097824875 + ... + 1097825968.

It is an arithmetic number, because the mean of its divisors is an integer number (300804165628).

Almost surely, 2^{1201021011121} is an apocalyptic number.

It is an amenable number.

1201021011121 is a deficient number, since it is larger than the sum of its proper divisors (2195651391).

1201021011121 is an equidigital number, since it uses as much as digits as its factorization.

1201021011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195651390.

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

Adding to 1201021011121 its reverse (1211101201021), we get a palindrome (2412122212142).

The spelling of 1201021011121 in words is "one trillion, two hundred one billion, twenty-one million, eleven thousand, one hundred twenty-one".