21411423424 has 28 divisors (see below), whose sum is σ = 43086729168. Its totient is φ = 10554924800.

The previous prime is 21411423367. The next prime is 21411423457. The reversal of 21411423424 is 42432411412.

It is a junction number, because it is equal to n+sod(n) for n = 21411423392 and 21411423401.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2351467 + ... + 2360554.

It is an arithmetic number, because the mean of its divisors is an integer number (1538811756).

Almost surely, 2^21411423424 is an apocalyptic number.

It is an amenable number.

21411423424 is an abundant number, since it is smaller than the sum of its proper divisors (21675305744).

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

21411423424 is an equidigital number, since it uses as much as digits as its factorization.

21411423424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712104 (or 4712094 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

Adding to 21411423424 its reverse (42432411412), we get a palindrome (63843834836).

The spelling of 21411423424 in words is "twenty-one billion, four hundred eleven million, four hundred twenty-three thousand, four hundred twenty-four".