20021003122013 has 4 divisors (see below), whose sum is σ = 20021625446268. Its totient is φ = 20020380797760.

The previous prime is 20021003121979. The next prime is 20021003122069. The reversal of 20021003122013 is 31022130012002.

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 12130083911929 + 7890919210084 = 3482827^2 + 2809078^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021003122013 - 2¹² = 20021003117917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021003121982 and 20021003122000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021003122073) 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, 311113868 + ... + 311178213.

It is an arithmetic number, because the mean of its divisors is an integer number (5005406361567).

Almost surely, 2^{20021003122013} is an apocalyptic number.

It is an amenable number.

20021003122013 is a deficient number, since it is larger than the sum of its proper divisors (622324255).

20021003122013 is an equidigital number, since it uses as much as digits as its factorization.

20021003122013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622324254.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20021003122013 its reverse (31022130012002), we get a palindrome (51043133134015).

The spelling of 20021003122013 in words is "twenty trillion, twenty-one billion, three million, one hundred twenty-two thousand, thirteen".