20003311021 has 2 divisors, whose sum is σ = 20003311022. Its totient is φ = 20003311020.

The previous prime is 20003310989. The next prime is 20003311033. The reversal of 20003311021 is 12011330002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18663384996 + 1339926025 = 136614^2 + 36605^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003311021 - 2⁵ = 20003310989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20003310992 and 20003311010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20003311721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001655510 + 10001655511.

It is an arithmetic number, because the mean of its divisors is an integer number (10001655511).

Almost surely, 2^20003311021 is an apocalyptic number.

It is an amenable number.

20003311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003311021 is an equidigital number, since it uses as much as digits as its factorization.

20003311021 is an evil number, because the sum of its binary digits is even.

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

Adding to 20003311021 its reverse (12011330002), we get a palindrome (32014641023).

The spelling of 20003311021 in words is "twenty billion, three million, three hundred eleven thousand, twenty-one".