20352408821 has 2 divisors, whose sum is σ = 20352408822. Its totient is φ = 20352408820.

The previous prime is 20352408803. The next prime is 20352408863. The reversal of 20352408821 is 12880425302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18618602500 + 1733806321 = 136450^2 + 41639^2 .

It is a cyclic number.

It is not a de Polignac number, because 20352408821 - 2⁶ = 20352408757 is a prime.

It is a super-2 number, since 2×20352408821² (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 (20352408121) 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, 10176204410 + 10176204411.

It is an arithmetic number, because the mean of its divisors is an integer number (10176204411).

Almost surely, 2^20352408821 is an apocalyptic number.

It is an amenable number.

20352408821 is a deficient number, since it is larger than the sum of its proper divisors (1).

20352408821 is an equidigital number, since it uses as much as digits as its factorization.

20352408821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30720, while the sum is 35.

The spelling of 20352408821 in words is "twenty billion, three hundred fifty-two million, four hundred eight thousand, eight hundred twenty-one".