20321055523429 has 2 divisors, whose sum is σ = 20321055523430. Its totient is φ = 20321055523428.

The previous prime is 20321055523423. The next prime is 20321055523459. The reversal of 20321055523429 is 92432555012302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18577625771329 + 1743429752100 = 4310177^2 + 1320390^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321055523429 - 2¹¹ = 20321055521381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20321055523423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160527761714 + 10160527761715.

It is an arithmetic number, because the mean of its divisors is an integer number (10160527761715).

Almost surely, 2^{20321055523429} is an apocalyptic number.

It is an amenable number.

20321055523429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321055523429 is an equidigital number, since it uses as much as digits as its factorization.

20321055523429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 20321055523429 in words is "twenty trillion, three hundred twenty-one billion, fifty-five million, five hundred twenty-three thousand, four hundred twenty-nine".