20633233021 has 2 divisors, whose sum is σ = 20633233022. Its totient is φ = 20633233020.

The previous prime is 20633233007. The next prime is 20633233069. The reversal of 20633233021 is 12033233602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12037161796 + 8596071225 = 109714^2 + 92715^2 .

It is a cyclic number.

It is not a de Polignac number, because 20633233021 - 2²⁹ = 20096362109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20633233091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10316616510 + 10316616511.

It is an arithmetic number, because the mean of its divisors is an integer number (10316616511).

Almost surely, 2^20633233021 is an apocalyptic number.

It is an amenable number.

20633233021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20633233021 is an equidigital number, since it uses as much as digits as its factorization.

20633233021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 20633233021 its reverse (12033233602), we get a palindrome (32666466623).

The spelling of 20633233021 in words is "twenty billion, six hundred thirty-three million, two hundred thirty-three thousand, twenty-one".