20522455021 has 2 divisors, whose sum is σ = 20522455022. Its totient is φ = 20522455020.

The previous prime is 20522454983. The next prime is 20522455043. The reversal of 20522455021 is 12055422502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20320502500 + 201952521 = 142550^2 + 14211^2 .

It is a cyclic number.

It is not a de Polignac number, because 20522455021 - 2⁹ = 20522454509 is a prime.

It is a super-2 number, since 2×20522455021² (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 (20522455061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261227510 + 10261227511.

It is an arithmetic number, because the mean of its divisors is an integer number (10261227511).

Almost surely, 2^20522455021 is an apocalyptic number.

It is an amenable number.

20522455021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20522455021 is an equidigital number, since it uses as much as digits as its factorization.

20522455021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8000, while the sum is 28.

Adding to 20522455021 its reverse (12055422502), we get a palindrome (32577877523).

The spelling of 20522455021 in words is "twenty billion, five hundred twenty-two million, four hundred fifty-five thousand, twenty-one".