21113424404 has 36 divisors (see below), whose sum is σ = 38013042816. Its totient is φ = 10260864864.

The previous prime is 21113424403. The next prime is 21113424427. The reversal of 21113424404 is 40442431112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113424401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9565469 + ... + 9567675.

It is an arithmetic number, because the mean of its divisors is an integer number (1055917856).

Almost surely, 2^21113424404 is an apocalyptic number.

It is an amenable number.

21113424404 is a deficient number, since it is larger than the sum of its proper divisors (16899618412).

21113424404 is a wasteful number, since it uses less digits than its factorization.

21113424404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4032 (or 3993 counting only the distinct ones).

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

Adding to 21113424404 its reverse (40442431112), we get a palindrome (61555855516).

The spelling of 21113424404 in words is "twenty-one billion, one hundred thirteen million, four hundred twenty-four thousand, four hundred four".