2172022001872 has 10 divisors (see below), whose sum is σ = 4208292628658. Its totient is φ = 1086011000928.

The previous prime is 2172022001837. The next prime is 2172022001879. The reversal of 2172022001872 is 2781002202712.

It can be written as a sum of positive squares in only one way, i.e., 2166442509456 + 5579492416 = 1471884^2 + 74696^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172022001879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67875687543 + ... + 67875687574.

Almost surely, 2^{2172022001872} is an apocalyptic number.

It is an amenable number.

2172022001872 is a deficient number, since it is larger than the sum of its proper divisors (2036270626786).

2172022001872 is a wasteful number, since it uses less digits than its factorization.

2172022001872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135751375125 (or 135751375119 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The spelling of 2172022001872 in words is "two trillion, one hundred seventy-two billion, twenty-two million, one thousand, eight hundred seventy-two".