27977636413421 has 2 divisors, whose sum is σ = 27977636413422. Its totient is φ = 27977636413420.

The previous prime is 27977636413403. The next prime is 27977636413453. The reversal of 27977636413421 is 12431463677972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24892256337796 + 3085380075625 = 4989214^2 + 1756525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27977636413421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27977636413471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13988818206710 + 13988818206711.

It is an arithmetic number, because the mean of its divisors is an integer number (13988818206711).

Almost surely, 2^{27977636413421} is an apocalyptic number.

It is an amenable number.

27977636413421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27977636413421 is an equidigital number, since it uses as much as digits as its factorization.

27977636413421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64012032, while the sum is 62.

The spelling of 27977636413421 in words is "twenty-seven trillion, nine hundred seventy-seven billion, six hundred thirty-six million, four hundred thirteen thousand, four hundred twenty-one".