1210201023121 has 4 divisors (see below), whose sum is σ = 1211198716852. Its totient is φ = 1209203329392.

The previous prime is 1210201023037. The next prime is 1210201023131. The reversal of 1210201023121 is 1213201020121.

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 464285518225 + 745915504896 = 681385^2 + 863664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210201023121 - 2¹³ = 1210201014929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210201023095 and 1210201023104.

It is not an unprimeable number, because it can be changed into a prime (1210201023131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498845046 + ... + 498847471.

It is an arithmetic number, because the mean of its divisors is an integer number (302799679213).

Almost surely, 2^{1210201023121} is an apocalyptic number.

It is an amenable number.

1210201023121 is a deficient number, since it is larger than the sum of its proper divisors (997693731).

1210201023121 is an equidigital number, since it uses as much as digits as its factorization.

1210201023121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997693730.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1210201023121 its reverse (1213201020121), we get a palindrome (2423402043242).

The spelling of 1210201023121 in words is "one trillion, two hundred ten billion, two hundred one million, twenty-three thousand, one hundred twenty-one".