21113433424 has 40 divisors (see below), whose sum is σ = 43960097088. Its totient is φ = 9787430400.

The previous prime is 21113433409. The next prime is 21113433427. The reversal of 21113433424 is 42433431112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21113433392 and 21113433401.

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 7 ways as a sum of consecutive naturals, for example, 561052 + ... + 597499.

Almost surely, 2^21113433424 is an apocalyptic number.

It is an amenable number.

21113433424 is an abundant number, since it is smaller than the sum of its proper divisors (22846663664).

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

21113433424 is a wasteful number, since it uses less digits than its factorization.

21113433424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158643 (or 1158637 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

Adding to 21113433424 its reverse (42433431112), we get a palindrome (63546864536).

The spelling of 21113433424 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty-three thousand, four hundred twenty-four".