21232001424 has 40 divisors (see below), whose sum is σ = 54854569440. Its totient is φ = 7076658688.

The previous prime is 21232001423. The next prime is 21232001473. The reversal of 21232001424 is 42410023212.

It is a self number, because there is not a number n which added to its sum of digits gives 21232001424.

It is not an unprimeable number, because it can be changed into a prime (21232001423) 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, 921112 + ... + 943880.

It is an arithmetic number, because the mean of its divisors is an integer number (1371364236).

Almost surely, 2^21232001424 is an apocalyptic number.

21232001424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21232001424 is an abundant number, since it is smaller than the sum of its proper divisors (33622568016).

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

21232001424 is a wasteful number, since it uses less digits than its factorization.

21232001424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42207 (or 42201 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21232001424 its reverse (42410023212), we get a palindrome (63642024636).

The spelling of 21232001424 in words is "twenty-one billion, two hundred thirty-two million, one thousand, four hundred twenty-four".