27077072821 has 2 divisors, whose sum is σ = 27077072822. Its totient is φ = 27077072820.

The previous prime is 27077072741. The next prime is 27077072831. The reversal of 27077072821 is 12827077072.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24550502596 + 2526570225 = 156686^2 + 50265^2 .

It is a cyclic number.

It is not a de Polignac number, because 27077072821 - 2¹³ = 27077064629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27077072831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13538536410 + 13538536411.

It is an arithmetic number, because the mean of its divisors is an integer number (13538536411).

Almost surely, 2^27077072821 is an apocalyptic number.

It is an amenable number.

27077072821 is a deficient number, since it is larger than the sum of its proper divisors (1).

27077072821 is an equidigital number, since it uses as much as digits as its factorization.

27077072821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153664, while the sum is 43.

The spelling of 27077072821 in words is "twenty-seven billion, seventy-seven million, seventy-two thousand, eight hundred twenty-one".