1210121110001 has 4 divisors (see below), whose sum is σ = 1210130644452. Its totient is φ = 1210111575552.

The previous prime is 1210121109949. The next prime is 1210121110007. The reversal of 1210121110001 is 1000111210121.

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 649982626225 + 560138483776 = 806215^2 + 748424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210121110001 - 2²⁶ = 1210054001137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210121110007) 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, 4574240 + ... + 4831553.

It is an arithmetic number, because the mean of its divisors is an integer number (302532661113).

Almost surely, 2^{1210121110001} is an apocalyptic number.

It is an amenable number.

1210121110001 is a deficient number, since it is larger than the sum of its proper divisors (9534451).

1210121110001 is an equidigital number, since it uses as much as digits as its factorization.

1210121110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9534450.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1210121110001 its reverse (1000111210121), we get a palindrome (2210232320122).

The spelling of 1210121110001 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, one hundred ten thousand, one".