21043242312 has 32 divisors (see below), whose sum is σ = 53099776800. Its totient is φ = 6948857984.

The previous prime is 21043242299. The next prime is 21043242329. The reversal of 21043242312 is 21324234012.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4094637 + ... + 4099772.

It is an arithmetic number, because the mean of its divisors is an integer number (1659368025).

Almost surely, 2^21043242312 is an apocalyptic number.

It is an amenable number.

21043242312 is an abundant number, since it is smaller than the sum of its proper divisors (32056534488).

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

21043242312 is a wasteful number, since it uses less digits than its factorization.

21043242312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8194525 (or 8194521 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21043242312 its reverse (21324234012), we get a palindrome (42367476324).

The spelling of 21043242312 in words is "twenty-one billion, forty-three million, two hundred forty-two thousand, three hundred twelve".