2921131155571 has 4 divisors (see below), whose sum is σ = 2921558165944. Its totient is φ = 2920704145200.

The previous prime is 2921131155559. The next prime is 2921131155623. The reversal of 2921131155571 is 1755511311292.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2921131155571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2921131159571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213494925 + ... + 213508606.

It is an arithmetic number, because the mean of its divisors is an integer number (730389541486).

Almost surely, 2^{2921131155571} is an apocalyptic number.

2921131155571 is a deficient number, since it is larger than the sum of its proper divisors (427010373).

2921131155571 is an equidigital number, since it uses as much as digits as its factorization.

2921131155571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427010372.

The product of its digits is 94500, while the sum is 43.

The spelling of 2921131155571 in words is "two trillion, nine hundred twenty-one billion, one hundred thirty-one million, one hundred fifty-five thousand, five hundred seventy-one".