2173123700 has 144 divisors (see below), whose sum is σ = 5375280960. Its totient is φ = 761622400.

The previous prime is 2173123699. The next prime is 2173123703. The reversal of 2173123700 is 73213712.

It is a self number, because there is not a number n which added to its sum of digits gives 2173123700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173123703) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3859619 + ... + 3860181.

It is an arithmetic number, because the mean of its divisors is an integer number (37328340).

Almost surely, 2^2173123700 is an apocalyptic number.

2173123700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2173123700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2687640480).

2173123700 is an abundant number, since it is smaller than the sum of its proper divisors (3202157260).

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

2173123700 is a wasteful number, since it uses less digits than its factorization.

2173123700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 610 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 2173123700 is about 46616.7748777197. The cubic root of 2173123700 is about 1295.2735070254.

The spelling of 2173123700 in words is "two billion, one hundred seventy-three million, one hundred twenty-three thousand, seven hundred".