2171857004672 has 32 divisors (see below), whose sum is σ = 4327240129680. Its totient is φ = 1085804580096.

The previous prime is 2171857004671. The next prime is 2171857004719. The reversal of 2171857004672 is 2764007581712.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 2171857004672.

It is not an unprimeable number, because it can be changed into a prime (2171857004671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163043 + ... + 2090525.

Almost surely, 2^{2171857004672} is an apocalyptic number.

It is an amenable number.

2171857004672 is a deficient number, since it is larger than the sum of its proper divisors (2155383125008).

2171857004672 is an equidigital number, since it uses as much as digits as its factorization.

2171857004672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936300 (or 1936288 counting only the distinct ones).

The product of its (nonzero) digits is 1317120, while the sum is 50.

The spelling of 2171857004672 in words is "two trillion, one hundred seventy-one billion, eight hundred fifty-seven million, four thousand, six hundred seventy-two".