2173177921220 has 12 divisors (see below), whose sum is σ = 4563673634604. Its totient is φ = 869271168480.

The previous prime is 2173177921183. The next prime is 2173177921261. The reversal of 2173177921220 is 221297713712.

It can be written as a sum of positive squares in 2 ways, for example, as 1202373654784 + 970804266436 = 1096528^2 + 985294^2 .

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, 54329448011 + ... + 54329448050.

It is an arithmetic number, because the mean of its divisors is an integer number (380306136217).

Almost surely, 2^{2173177921220} is an apocalyptic number.

2173177921220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2173177921220 is an abundant number, since it is smaller than the sum of its proper divisors (2390495713384).

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

2173177921220 is a wasteful number, since it uses less digits than its factorization.

2173177921220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108658896070 (or 108658896068 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 44.

The spelling of 2173177921220 in words is "two trillion, one hundred seventy-three billion, one hundred seventy-seven million, nine hundred twenty-one thousand, two hundred twenty".