2787275043821 has 2 divisors, whose sum is σ = 2787275043822. Its totient is φ = 2787275043820.

The previous prime is 2787275043799. The next prime is 2787275043869. The reversal of 2787275043821 is 1283405727872.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1602214197796 + 1185060846025 = 1265786^2 + 1088605^2 .

It is a cyclic number.

It is not a de Polignac number, because 2787275043821 - 2²⁶ = 2787207934957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2787275043871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1393637521910 + 1393637521911.

It is an arithmetic number, because the mean of its divisors is an integer number (1393637521911).

Almost surely, 2^{2787275043821} is an apocalyptic number.

It is an amenable number.

2787275043821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2787275043821 is an equidigital number, since it uses as much as digits as its factorization.

2787275043821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10536960, while the sum is 56.

The spelling of 2787275043821 in words is "two trillion, seven hundred eighty-seven billion, two hundred seventy-five million, forty-three thousand, eight hundred twenty-one".