27523020521 has 2 divisors, whose sum is σ = 27523020522. Its totient is φ = 27523020520.

The previous prime is 27523020493. The next prime is 27523020523. The reversal of 27523020521 is 12502032572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27072095296 + 450925225 = 164536^2 + 21235^2 .

It is a cyclic number.

It is not a de Polignac number, because 27523020521 - 2¹⁸ = 27522758377 is a prime.

It is a super-2 number, since 2×27523020521² (a number of 22 digits) contains 22 as substring.

Together with 27523020523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27523020523) 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, 13761510260 + 13761510261.

It is an arithmetic number, because the mean of its divisors is an integer number (13761510261).

Almost surely, 2^27523020521 is an apocalyptic number.

It is an amenable number.

27523020521 is a deficient number, since it is larger than the sum of its proper divisors (1).

27523020521 is an equidigital number, since it uses as much as digits as its factorization.

27523020521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 29.

The spelling of 27523020521 in words is "twenty-seven billion, five hundred twenty-three million, twenty thousand, five hundred twenty-one".