20021010013 has 4 divisors (see below), whose sum is σ = 20031088000. Its totient is φ = 20010932028.

The previous prime is 20021009999. The next prime is 20021010029. The reversal of 20021010013 is 31001012002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31001012002 = 2 ⋅15500506001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021010013 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 (20021010073) 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, 5036013 + ... + 5039986.

It is an arithmetic number, because the mean of its divisors is an integer number (5007772000).

Almost surely, 2^20021010013 is an apocalyptic number.

It is an amenable number.

20021010013 is a deficient number, since it is larger than the sum of its proper divisors (10077987).

20021010013 is a wasteful number, since it uses less digits than its factorization.

20021010013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10077986.

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

Adding to 20021010013 its reverse (31001012002), we get a palindrome (51022022015).

The spelling of 20021010013 in words is "twenty billion, twenty-one million, ten thousand, thirteen".