13210321001021 has 4 divisors (see below), whose sum is σ = 13426883640444. Its totient is φ = 12993758361600.

The previous prime is 13210321000979. The next prime is 13210321001027. The reversal of 13210321001021 is 12010012301231.

13210321001021 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1171405759225 + 12038915241796 = 1082315^2 + 3469714^2 .

It is a cyclic number.

It is not a de Polignac number, because 13210321001021 - 2¹⁸ = 13210320738877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13210321001027) 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, 108281319620 + ... + 108281319741.

It is an arithmetic number, because the mean of its divisors is an integer number (3356720910111).

Almost surely, 2^{13210321001021} is an apocalyptic number.

It is an amenable number.

13210321001021 is a deficient number, since it is larger than the sum of its proper divisors (216562639423).

13210321001021 is an equidigital number, since it uses as much as digits as its factorization.

13210321001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216562639422.

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

Adding to 13210321001021 its reverse (12010012301231), we get a palindrome (25220333302252).

The spelling of 13210321001021 in words is "thirteen trillion, two hundred ten billion, three hundred twenty-one million, one thousand, twenty-one".