20200013021 has 2 divisors, whose sum is σ = 20200013022. Its totient is φ = 20200013020.

The previous prime is 20200012991. The next prime is 20200013023. The reversal of 20200013021 is 12031000202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18425076121 + 1774936900 = 135739^2 + 42130^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200013021 - 2¹⁴ = 20199996637 is a prime.

Together with 20200013023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20200012993 and 20200013011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20200013023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100006510 + 10100006511.

It is an arithmetic number, because the mean of its divisors is an integer number (10100006511).

Almost surely, 2^20200013021 is an apocalyptic number.

It is an amenable number.

20200013021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200013021 is an equidigital number, since it uses as much as digits as its factorization.

20200013021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20200013021 its reverse (12031000202), we get a palindrome (32231013223).

The spelling of 20200013021 in words is "twenty billion, two hundred million, thirteen thousand, twenty-one".