21203233320 has 64 divisors (see below), whose sum is σ = 65328894720. Its totient is φ = 5501378304.

The previous prime is 21203233309. The next prime is 21203233321. The reversal of 21203233320 is 2333230212.

It is not an unprimeable number, because it can be changed into a prime (21203233321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2383312 + ... + 2392191.

It is an arithmetic number, because the mean of its divisors is an integer number (1020763980).

Almost surely, 2^21203233320 is an apocalyptic number.

21203233320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203233320 is an abundant number, since it is smaller than the sum of its proper divisors (44125661400).

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

21203233320 is a wasteful number, since it uses less digits than its factorization.

21203233320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775554 (or 4775550 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 21.

Adding to 21203233320 its reverse (2333230212), we get a palindrome (23536463532).

The spelling of 21203233320 in words is "twenty-one billion, two hundred three million, two hundred thirty-three thousand, three hundred twenty".