27843484021 has 2 divisors, whose sum is σ = 27843484022. Its totient is φ = 27843484020.

The previous prime is 27843484001. The next prime is 27843484033. The reversal of 27843484021 is 12048434872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20246444100 + 7597039921 = 142290^2 + 87161^2 .

It is a cyclic number.

It is not a de Polignac number, because 27843484021 - 2⁵ = 27843483989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27843484001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13921742010 + 13921742011.

It is an arithmetic number, because the mean of its divisors is an integer number (13921742011).

Almost surely, 2^27843484021 is an apocalyptic number.

It is an amenable number.

27843484021 is a deficient number, since it is larger than the sum of its proper divisors (1).

27843484021 is an equidigital number, since it uses as much as digits as its factorization.

27843484021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 344064, while the sum is 43.

The spelling of 27843484021 in words is "twenty-seven billion, eight hundred forty-three million, four hundred eighty-four thousand, twenty-one".