21545552305027 has 2 divisors, whose sum is σ = 21545552305028. Its totient is φ = 21545552305026.

The previous prime is 21545552305001. The next prime is 21545552305049. The reversal of 21545552305027 is 72050325554512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21545552305027 - 2³⁹ = 20995796491139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21545552305127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10772776152513 + 10772776152514.

It is an arithmetic number, because the mean of its divisors is an integer number (10772776152514).

Almost surely, 2^{21545552305027} is an apocalyptic number.

21545552305027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21545552305027 is an equidigital number, since it uses as much as digits as its factorization.

21545552305027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100000, while the sum is 46.

Adding to 21545552305027 its reverse (72050325554512), we get a palindrome (93595877859539).

The spelling of 21545552305027 in words is "twenty-one trillion, five hundred forty-five billion, five hundred fifty-two million, three hundred five thousand, twenty-seven".