2145443100 has 72 divisors (see below), whose sum is σ = 6226195248. Its totient is φ = 570393600.

The previous prime is 2145443089. The next prime is 2145443101. The reversal of 2145443100 is 13445412.

It is a super-2 number, since 2×2145443100² = 9205852190675220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145443101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90490 + ... + 111710.

It is an arithmetic number, because the mean of its divisors is an integer number (86474934).

Almost surely, 2^2145443100 is an apocalyptic number.

2145443100 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 2145443100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3113097624).

2145443100 is an abundant number, since it is smaller than the sum of its proper divisors (4080752148).

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

2145443100 is a wasteful number, since it uses less digits than its factorization.

2145443100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21575 (or 21568 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 2145443100 is about 46318.9280964057. The cubic root of 2145443100 is about 1289.7503873745.

Adding to 2145443100 its reverse (13445412), we get a palindrome (2158888512).

The spelling of 2145443100 in words is "two billion, one hundred forty-five million, four hundred forty-three thousand, one hundred".