2143512240 has 80 divisors (see below), whose sum is σ = 6744115968. Its totient is φ = 563067648.

The previous prime is 2143512211. The next prime is 2143512247. The reversal of 2143512240 is 422153412.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2143512240.

It is not an unprimeable number, because it can be changed into a prime (2143512247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50572 + ... + 82731.

Almost surely, 2^2143512240 is an apocalyptic number.

2143512240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2143512240 is an abundant number, since it is smaller than the sum of its proper divisors (4600603728).

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

2143512240 is a wasteful number, since it uses less digits than its factorization.

2143512240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133386 (or 133380 counting only the distinct ones).

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

The square root of 2143512240 is about 46298.0803057751. The cubic root of 2143512240 is about 1289.3633539003.

Adding to 2143512240 its reverse (422153412), we get a palindrome (2565665652).

The spelling of 2143512240 in words is "two billion, one hundred forty-three million, five hundred twelve thousand, two hundred forty".