20325503621 has 2 divisors, whose sum is σ = 20325503622. Its totient is φ = 20325503620.

The previous prime is 20325503567. The next prime is 20325503647. The reversal of 20325503621 is 12630552302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11531752996 + 8793750625 = 107386^2 + 93775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20325503621 is a prime.

It is a super-2 number, since 2×20325503621² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20325503651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10162751810 + 10162751811.

It is an arithmetic number, because the mean of its divisors is an integer number (10162751811).

Almost surely, 2^20325503621 is an apocalyptic number.

It is an amenable number.

20325503621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20325503621 is an equidigital number, since it uses as much as digits as its factorization.

20325503621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 29.

The spelling of 20325503621 in words is "twenty billion, three hundred twenty-five million, five hundred three thousand, six hundred twenty-one".