121021020313 has 4 divisors (see below), whose sum is σ = 121082360868. Its totient is φ = 120959679760.

The previous prime is 121021020229. The next prime is 121021020317. The reversal of 121021020313 is 313020120121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313020120121 = 79609 ⋅3931969.

It can be written as a sum of positive squares in 2 ways, for example, as 76957972569 + 44063047744 = 277413^2 + 209912^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121021020313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121021020317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30667318 + ... + 30671263.

It is an arithmetic number, because the mean of its divisors is an integer number (30270590217).

Almost surely, 2^121021020313 is an apocalyptic number.

It is an amenable number.

121021020313 is a deficient number, since it is larger than the sum of its proper divisors (61340555).

121021020313 is an equidigital number, since it uses as much as digits as its factorization.

121021020313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61340554.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 121021020313 its reverse (313020120121), we get a palindrome (434041140434).

The spelling of 121021020313 in words is "one hundred twenty-one billion, twenty-one million, twenty thousand, three hundred thirteen".