2172020191872 has 32 divisors (see below), whose sum is σ = 5769428635680. Its totient is φ = 724006730496.

The previous prime is 2172020191813. The next prime is 2172020191883. The reversal of 2172020191872 is 2781910202712.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2828150908 + ... + 2828151675.

It is an arithmetic number, because the mean of its divisors is an integer number (180294644865).

Almost surely, 2^{2172020191872} is an apocalyptic number.

It is an amenable number.

2172020191872 is an abundant number, since it is smaller than the sum of its proper divisors (3597408443808).

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

2172020191872 is an equidigital number, since it uses as much as digits as its factorization.

2172020191872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5656302600 (or 5656302588 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 42.

The spelling of 2172020191872 in words is "two trillion, one hundred seventy-two billion, twenty million, one hundred ninety-one thousand, eight hundred seventy-two".