20132690821 has 2 divisors, whose sum is σ = 20132690822. Its totient is φ = 20132690820.

The previous prime is 20132690813. The next prime is 20132690839. The reversal of 20132690821 is 12809623102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20132488321 + 202500 = 141889^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 20132690821 - 2³ = 20132690813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20132690021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10066345410 + 10066345411.

It is an arithmetic number, because the mean of its divisors is an integer number (10066345411).

Almost surely, 2^20132690821 is an apocalyptic number.

It is an amenable number.

20132690821 is a deficient number, since it is larger than the sum of its proper divisors (1).

20132690821 is an equidigital number, since it uses as much as digits as its factorization.

20132690821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 20132690821 in words is "twenty billion, one hundred thirty-two million, six hundred ninety thousand, eight hundred twenty-one".