20624501021 has 2 divisors, whose sum is σ = 20624501022. Its totient is φ = 20624501020.

The previous prime is 20624501017. The next prime is 20624501033. The reversal of 20624501021 is 12010542602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18516405625 + 2108095396 = 136075^2 + 45914^2 .

It is a cyclic number.

It is not a de Polignac number, because 20624501021 - 2² = 20624501017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20624501621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10312250510 + 10312250511.

It is an arithmetic number, because the mean of its divisors is an integer number (10312250511).

Almost surely, 2^20624501021 is an apocalyptic number.

It is an amenable number.

20624501021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20624501021 is an equidigital number, since it uses as much as digits as its factorization.

20624501021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The spelling of 20624501021 in words is "twenty billion, six hundred twenty-four million, five hundred one thousand, twenty-one".