2155347152521 has 2 divisors, whose sum is σ = 2155347152522. Its totient is φ = 2155347152520.

The previous prime is 2155347152477. The next prime is 2155347152533. The reversal of 2155347152521 is 1252517435512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1197297712521 + 958049440000 = 1094211^2 + 978800^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155347152521 - 2⁷ = 2155347152393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2155347152821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077673576260 + 1077673576261.

It is an arithmetic number, because the mean of its divisors is an integer number (1077673576261).

Almost surely, 2^{2155347152521} is an apocalyptic number.

It is an amenable number.

2155347152521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155347152521 is an equidigital number, since it uses as much as digits as its factorization.

2155347152521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 420000, while the sum is 43.

The spelling of 2155347152521 in words is "two trillion, one hundred fifty-five billion, three hundred forty-seven million, one hundred fifty-two thousand, five hundred twenty-one".