2143865100 has 288 divisors, whose sum is σ = 6982053120. Its totient is φ = 504437760.

The previous prime is 2143865081. The next prime is 2143865111. The reversal of 2143865100 is 15683412.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11976811 + ... + 11976989.

It is an arithmetic number, because the mean of its divisors is an integer number (24243240).

Almost surely, 2^2143865100 is an apocalyptic number.

2143865100 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 2143865100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3491026560).

2143865100 is an abundant number, since it is smaller than the sum of its proper divisors (4838188020).

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

2143865100 is a wasteful number, since it uses less digits than its factorization.

2143865100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 2143865100 is about 46301.8908901138. The cubic root of 2143865100 is about 1289.4341006840.

The spelling of 2143865100 in words is "two billion, one hundred forty-three million, eight hundred sixty-five thousand, one hundred".