20535450521 has 2 divisors, whose sum is σ = 20535450522. Its totient is φ = 20535450520.

The previous prime is 20535450503. The next prime is 20535450541. The reversal of 20535450521 is 12505453502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20410122496 + 125328025 = 142864^2 + 11195^2 .

It is a cyclic number.

It is not a de Polignac number, because 20535450521 - 2⁶ = 20535450457 is a prime.

It is not a weakly prime, because it can be changed into another prime (20535450541) 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, 10267725260 + 10267725261.

It is an arithmetic number, because the mean of its divisors is an integer number (10267725261).

Almost surely, 2^20535450521 is an apocalyptic number.

It is an amenable number.

20535450521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20535450521 is an equidigital number, since it uses as much as digits as its factorization.

20535450521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30000, while the sum is 32.

The spelling of 20535450521 in words is "twenty billion, five hundred thirty-five million, four hundred fifty thousand, five hundred twenty-one".