13020001021 has 4 divisors (see below), whose sum is σ = 13785883452. Its totient is φ = 12254118592.

The previous prime is 13020001019. The next prime is 13020001063. The reversal of 13020001021 is 12010002031.

13020001021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12010002031 = 199 ⋅60351769.

It can be written as a sum of positive squares in 2 ways, for example, as 11751644025 + 1268356996 = 108405^2 + 35614^2 .

It is a cyclic number.

It is not a de Polignac number, because 13020001021 - 2¹ = 13020001019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13020000989 and 13020001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13020001121) 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, 382941190 + ... + 382941223.

It is an arithmetic number, because the mean of its divisors is an integer number (3446470863).

Almost surely, 2^13020001021 is an apocalyptic number.

It is an amenable number.

13020001021 is a deficient number, since it is larger than the sum of its proper divisors (765882431).

13020001021 is an equidigital number, since it uses as much as digits as its factorization.

13020001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765882430.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 13020001021 its reverse (12010002031), we get a palindrome (25030003052).

The spelling of 13020001021 in words is "thirteen billion, twenty million, one thousand, twenty-one".