21330330203 has 16 divisors (see below), whose sum is σ = 27394139136. Its totient is φ = 16142971680.

The previous prime is 21330330199. The next prime is 21330330209. The reversal of 21330330203 is 30203303312.

It is a cyclic number.

It is not a de Polignac number, because 21330330203 - 2² = 21330330199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21330330209) 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, 5093543 + ... + 5097728.

It is an arithmetic number, because the mean of its divisors is an integer number (1712133696).

Almost surely, 2^21330330203 is an apocalyptic number.

21330330203 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21330330203 is a deficient number, since it is larger than the sum of its proper divisors (6063808933).

21330330203 is a wasteful number, since it uses less digits than its factorization.

21330330203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10191314.

The product of its (nonzero) digits is 972, while the sum is 20.

Adding to 21330330203 its reverse (30203303312), we get a palindrome (51533633515).

The spelling of 21330330203 in words is "twenty-one billion, three hundred thirty million, three hundred thirty thousand, two hundred three".