2171256521712 has 80 divisors (see below), whose sum is σ = 5616482263200. Its totient is φ = 722797428736.

The previous prime is 2171256521653. The next prime is 2171256521717.

2171256521712 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171256521717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283857664 + ... + 283865312.

It is an arithmetic number, because the mean of its divisors is an integer number (70206028290).

Almost surely, 2^{2171256521712} is an apocalyptic number.

It is an amenable number.

2171256521712 is an abundant number, since it is smaller than the sum of its proper divisors (3445225741488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2171256521712 is a wasteful number, since it uses less digits than its factorization.

2171256521712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14690 (or 14684 counting only the distinct ones).

The product of its digits is 117600, while the sum is 42.

The spelling of 2171256521712 in words is "two trillion, one hundred seventy-one billion, two hundred fifty-six million, five hundred twenty-one thousand, seven hundred twelve".