21113433423 has 6 divisors (see below), whose sum is σ = 30497181624. Its totient is φ = 14075622276.

The previous prime is 21113433409. The next prime is 21113433427. The reversal of 21113433423 is 32433431112.

It is a happy number.

21113433423 is a `hidden beast` number, since 211 + 13 + 433 + 4 + 2 + 3 = 666.

It is not a de Polignac number, because 21113433423 - 2⁵ = 21113433391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113433427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1172968515 + ... + 1172968532.

It is an arithmetic number, because the mean of its divisors is an integer number (5082863604).

Almost surely, 2^21113433423 is an apocalyptic number.

21113433423 is a deficient number, since it is larger than the sum of its proper divisors (9383748201).

21113433423 is a wasteful number, since it uses less digits than its factorization.

21113433423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345937053 (or 2345937050 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 21113433423 its reverse (32433431112), we get a palindrome (53546864535).

The spelling of 21113433423 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty-three thousand, four hundred twenty-three".