21432012243 has 8 divisors (see below), whose sum is σ = 29044475856. Its totient is φ = 14053778400.

The previous prime is 21432012197. The next prime is 21432012263. The reversal of 21432012243 is 34221023412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21432012243 - 2¹⁰ = 21432011219 is a prime.

It is a super-2 number, since 2×21432012243² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21432012263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58557228 + ... + 58557593.

It is an arithmetic number, because the mean of its divisors is an integer number (3630559482).

Almost surely, 2^21432012243 is an apocalyptic number.

21432012243 is a deficient number, since it is larger than the sum of its proper divisors (7612463613).

21432012243 is a wasteful number, since it uses less digits than its factorization.

21432012243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117114885.

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

Adding to 21432012243 its reverse (34221023412), we get a palindrome (55653035655).

The spelling of 21432012243 in words is "twenty-one billion, four hundred thirty-two million, twelve thousand, two hundred forty-three".