20001313021 has 8 divisors (see below), whose sum is σ = 20712220920. Its totient is φ = 19291819008.

The previous prime is 20001313001. The next prime is 20001313037. The reversal of 20001313021 is 12031310002.

It can be written as a sum of positive squares in 4 ways, for example, as 12541536121 + 7459776900 = 111989^2 + 86370^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001313021 - 2²¹ = 19999215869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001312992 and 20001313010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001313001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324636 + ... + 381301.

It is an arithmetic number, because the mean of its divisors is an integer number (2589027615).

Almost surely, 2^20001313021 is an apocalyptic number.

It is an amenable number.

20001313021 is a deficient number, since it is larger than the sum of its proper divisors (710907899).

20001313021 is an equidigital number, since it uses as much as digits as its factorization.

20001313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706943.

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

Adding to 20001313021 its reverse (12031310002), we get a palindrome (32032623023).

The spelling of 20001313021 in words is "twenty billion, one million, three hundred thirteen thousand, twenty-one".