2815533475021 has 2 divisors, whose sum is σ = 2815533475022. Its totient is φ = 2815533475020.

The previous prime is 2815533474889. The next prime is 2815533475033. The reversal of 2815533475021 is 1205743355182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2670380856900 + 145152618121 = 1634130^2 + 380989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2815533475021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2815533415021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1407766737510 + 1407766737511.

It is an arithmetic number, because the mean of its divisors is an integer number (1407766737511).

Almost surely, 2^{2815533475021} is an apocalyptic number.

It is an amenable number.

2815533475021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2815533475021 is an equidigital number, since it uses as much as digits as its factorization.

2815533475021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008000, while the sum is 46.

The spelling of 2815533475021 in words is "two trillion, eight hundred fifteen billion, five hundred thirty-three million, four hundred seventy-five thousand, twenty-one".