21112342424 has 32 divisors (see below), whose sum is σ = 40884877440. Its totient is φ = 10210080000.

The previous prime is 21112342417. The next prime is 21112342441. The reversal of 21112342424 is 42424321112.

It is a junction number, because it is equal to n+sod(n) for n = 21112342393 and 21112342402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452174 + ... + 496674.

It is an arithmetic number, because the mean of its divisors is an integer number (1277652420).

Almost surely, 2^21112342424 is an apocalyptic number.

It is an amenable number.

21112342424 is a deficient number, since it is larger than the sum of its proper divisors (19772535016).

21112342424 is a wasteful number, since it uses less digits than its factorization.

21112342424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46451 (or 46447 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

Adding to 21112342424 its reverse (42424321112), we get a palindrome (63536663536).

The spelling of 21112342424 in words is "twenty-one billion, one hundred twelve million, three hundred forty-two thousand, four hundred twenty-four".