121310210321021 has 4 divisors (see below), whose sum is σ = 121313365453500. Its totient is φ = 121307055188544.

The previous prime is 121310210320939. The next prime is 121310210321081. The reversal of 121310210321021 is 120123012013121.

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 46027065705625 + 75283144615396 = 6784325^2 + 8676586^2 .

It is a cyclic number.

It is not a de Polignac number, because 121310210321021 - 2²⁶ = 121310143212157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121310210320984 and 121310210321002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121310210321081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1577508566 + ... + 1577585463.

It is an arithmetic number, because the mean of its divisors is an integer number (30328341363375).

Almost surely, 2^{121310210321021} is an apocalyptic number.

It is an amenable number.

121310210321021 is a deficient number, since it is larger than the sum of its proper divisors (3155132479).

121310210321021 is an equidigital number, since it uses as much as digits as its factorization.

121310210321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3155132478.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 121310210321021 its reverse (120123012013121), we get a palindrome (241433222334142).

The spelling of 121310210321021 in words is "one hundred twenty-one trillion, three hundred ten billion, two hundred ten million, three hundred twenty-one thousand, twenty-one".