27632989421 has 2 divisors, whose sum is σ = 27632989422. Its totient is φ = 27632989420.

The previous prime is 27632989399. The next prime is 27632989451. The reversal of 27632989421 is 12498923672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15628500196 + 12004489225 = 125014^2 + 109565^2 .

It is a cyclic number.

It is not a de Polignac number, because 27632989421 - 2¹⁸ = 27632727277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27632989451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13816494710 + 13816494711.

It is an arithmetic number, because the mean of its divisors is an integer number (13816494711).

Almost surely, 2^27632989421 is an apocalyptic number.

It is an amenable number.

27632989421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27632989421 is an equidigital number, since it uses as much as digits as its factorization.

27632989421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 53.

The spelling of 27632989421 in words is "twenty-seven billion, six hundred thirty-two million, nine hundred eighty-nine thousand, four hundred twenty-one".