1320121021013 has 4 divisors (see below), whose sum is σ = 1377517587168. Its totient is φ = 1262724454860.

The previous prime is 1320121020991. The next prime is 1320121021027. The reversal of 1320121021013 is 3101201210231.

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 1320121021013 - 2¹⁰ = 1320121019989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320121020982 and 1320121021000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320121021313) 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, 28698283043 + ... + 28698283088.

It is an arithmetic number, because the mean of its divisors is an integer number (344379396792).

Almost surely, 2^{1320121021013} is an apocalyptic number.

It is an amenable number.

1320121021013 is a deficient number, since it is larger than the sum of its proper divisors (57396566155).

1320121021013 is an equidigital number, since it uses as much as digits as its factorization.

1320121021013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57396566154.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1320121021013 its reverse (3101201210231), we get a palindrome (4421322231244).

The spelling of 1320121021013 in words is "one trillion, three hundred twenty billion, one hundred twenty-one million, twenty-one thousand, thirteen".