21133320203 has 4 divisors (see below), whose sum is σ = 21136051680. Its totient is φ = 21130588728.

The previous prime is 21133320179. The next prime is 21133320227. The reversal of 21133320203 is 30202333112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21133320179) and next prime (21133320227).

It is a cyclic number.

It is not a de Polignac number, because 21133320203 - 2²⁴ = 21116542987 is a prime.

It is a super-2 number, since 2×21133320203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133320283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1354100 + ... + 1369617.

It is an arithmetic number, because the mean of its divisors is an integer number (5284012920).

Almost surely, 2^21133320203 is an apocalyptic number.

21133320203 is a deficient number, since it is larger than the sum of its proper divisors (2731477).

21133320203 is an equidigital number, since it uses as much as digits as its factorization.

21133320203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731476.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21133320203 its reverse (30202333112), we get a palindrome (51335653315).

The spelling of 21133320203 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty thousand, two hundred three".