21233442320 has 40 divisors (see below), whose sum is σ = 49377844824. Its totient is φ = 8491640832.

The previous prime is 21233442313. The next prime is 21233442331. The reversal of 21233442320 is 2324433212.

It can be written as a sum of positive squares in 4 ways, for example, as 1822265344 + 19411176976 = 42688^2 + 139324^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 21233442320.

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, 410552 + ... + 459368.

Almost surely, 2^21233442320 is an apocalyptic number.

21233442320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233442320 is an abundant number, since it is smaller than the sum of its proper divisors (28144402504).

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

21233442320 is a wasteful number, since it uses less digits than its factorization.

21233442320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54267 (or 54261 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21233442320 its reverse (2324433212), we get a palindrome (23557875532).

It can be divided in two parts, 2123 and 3442320, that added together give a palindrome (3444443).

The spelling of 21233442320 in words is "twenty-one billion, two hundred thirty-three million, four hundred forty-two thousand, three hundred twenty".