21113002423 has 8 divisors (see below), whose sum is σ = 22356540000. Its totient is φ = 19869642240.

The previous prime is 21113002411. The next prime is 21113002433. The reversal of 21113002423 is 32420031112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21113002423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113002423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113002433) 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, 260703 + ... + 331951.

It is an arithmetic number, because the mean of its divisors is an integer number (2794567500).

Almost surely, 2^21113002423 is an apocalyptic number.

21113002423 is a deficient number, since it is larger than the sum of its proper divisors (1243537577).

21113002423 is a wasteful number, since it uses less digits than its factorization.

21113002423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88697.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21113002423 its reverse (32420031112), we get a palindrome (53533033535).

The spelling of 21113002423 in words is "twenty-one billion, one hundred thirteen million, two thousand, four hundred twenty-three".