20213101001321 has 4 divisors (see below), whose sum is σ = 20216738419332. Its totient is φ = 20209463583312.

The previous prime is 20213101001311. The next prime is 20213101001339. The reversal of 20213101001321 is 12310010131202.

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 19448982010000 + 764118991321 = 4410100^2 + 874139^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213101001321 - 2¹⁸ = 20213100739177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20213101001321.

It is not an unprimeable number, because it can be changed into a prime (20213101001311) 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, 1818700670 + ... + 1818711783.

It is an arithmetic number, because the mean of its divisors is an integer number (5054184604833).

Almost surely, 2^{20213101001321} is an apocalyptic number.

It is an amenable number.

20213101001321 is a deficient number, since it is larger than the sum of its proper divisors (3637418011).

20213101001321 is an equidigital number, since it uses as much as digits as its factorization.

20213101001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3637418010.

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

Adding to 20213101001321 its reverse (12310010131202), we get a palindrome (32523111132523).

The spelling of 20213101001321 in words is "twenty trillion, two hundred thirteen billion, one hundred one million, one thousand, three hundred twenty-one".