27752513221 has 2 divisors, whose sum is σ = 27752513222. Its totient is φ = 27752513220.

The previous prime is 27752513101. The next prime is 27752513233. The reversal of 27752513221 is 12231525772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14038932196 + 13713581025 = 118486^2 + 117105^2 .

It is a cyclic number.

It is not a de Polignac number, because 27752513221 - 2¹¹ = 27752511173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27752511221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13876256610 + 13876256611.

It is an arithmetic number, because the mean of its divisors is an integer number (13876256611).

Almost surely, 2^27752513221 is an apocalyptic number.

It is an amenable number.

27752513221 is a deficient number, since it is larger than the sum of its proper divisors (1).

27752513221 is an equidigital number, since it uses as much as digits as its factorization.

27752513221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58800, while the sum is 37.

The spelling of 27752513221 in words is "twenty-seven billion, seven hundred fifty-two million, five hundred thirteen thousand, two hundred twenty-one".