21123203300 has 36 divisors (see below), whose sum is σ = 45843732480. Its totient is φ = 8448105120.

The previous prime is 21123203267. The next prime is 21123203303. The reversal of 21123203300 is 330232112.

It is not an unprimeable number, because it can be changed into a prime (21123203303) 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, 1239437 + ... + 1256363.

Almost surely, 2^21123203300 is an apocalyptic number.

21123203300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21123203300 is an abundant number, since it is smaller than the sum of its proper divisors (24720529180).

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

21123203300 is a wasteful number, since it uses less digits than its factorization.

21123203300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29420 (or 29413 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21123203300 its reverse (330232112), we get a palindrome (21453435412).

The spelling of 21123203300 in words is "twenty-one billion, one hundred twenty-three million, two hundred three thousand, three hundred".