21113430243 has 8 divisors (see below), whose sum is σ = 28152073488. Its totient is φ = 14075203584.

The previous prime is 21113430223. The next prime is 21113430253. The reversal of 21113430243 is 34203431112.

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 21113430243 - 2⁹ = 21113429731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21113430223) 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, 44371 + ... + 210227.

It is an arithmetic number, because the mean of its divisors is an integer number (3519009186).

Almost surely, 2^21113430243 is an apocalyptic number.

21113430243 is a deficient number, since it is larger than the sum of its proper divisors (7038643245).

21113430243 is a wasteful number, since it uses less digits than its factorization.

21113430243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208293.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21113430243 its reverse (34203431112), we get a palindrome (55316861355).

The spelling of 21113430243 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty thousand, two hundred forty-three".