21232004424 has 32 divisors (see below), whose sum is σ = 53089033920. Its totient is φ = 7076131776.

The previous prime is 21232004413. The next prime is 21232004441. The reversal of 21232004424 is 42440023212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21232004394 and 21232004403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75069 + ... + 219315.

It is an arithmetic number, because the mean of its divisors is an integer number (1659032310).

Almost surely, 2^21232004424 is an apocalyptic number.

21232004424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21232004424 is an abundant number, since it is smaller than the sum of its proper divisors (31857029496).

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

21232004424 is a wasteful number, since it uses less digits than its factorization.

21232004424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150389 (or 150385 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21232004424 its reverse (42440023212), we get a palindrome (63672027636).

The spelling of 21232004424 in words is "twenty-one billion, two hundred thirty-two million, four thousand, four hundred twenty-four".