1302021013 has 4 divisors (see below), whose sum is σ = 1302093900. Its totient is φ = 1301948128.

The previous prime is 1302020989. The next prime is 1302021031. The reversal of 1302021013 is 3101202031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 633126244 + 668894769 = 25162^2 + 25863^2 .

It is a cyclic number.

It is not a de Polignac number, because 1302021013 - 2²¹ = 1299923861 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1302020984 and 1302021002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1302021713) 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, 10563 + ... + 52111.

It is an arithmetic number, because the mean of its divisors is an integer number (325523475).

Almost surely, 2^1302021013 is an apocalyptic number.

It is an amenable number.

1302021013 is a deficient number, since it is larger than the sum of its proper divisors (72887).

1302021013 is an equidigital number, since it uses as much as digits as its factorization.

1302021013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72886.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1302021013 is about 36083.5282781493. The cubic root of 1302021013 is about 1091.9581592582.

Adding to 1302021013 its reverse (3101202031), we get a palindrome (4403223044).

The spelling of 1302021013 in words is "one billion, three hundred two million, twenty-one thousand, thirteen".