21133242303 has 4 divisors (see below), whose sum is σ = 28177656408. Its totient is φ = 14088828200.

The previous prime is 21133242301. The next prime is 21133242311. The reversal of 21133242303 is 30324233112.

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

It is a cyclic number.

It is not a de Polignac number, because 21133242303 - 2¹ = 21133242301 is a prime.

It is a super-2 number, since 2×21133242303² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133242301) 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, 3522207048 + ... + 3522207053.

It is an arithmetic number, because the mean of its divisors is an integer number (7044414102).

Almost surely, 2^21133242303 is an apocalyptic number.

21133242303 is a deficient number, since it is larger than the sum of its proper divisors (7044414105).

21133242303 is an equidigital number, since it uses as much as digits as its factorization.

21133242303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7044414104.

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21133242303 its reverse (30324233112), we get a palindrome (51457475415).

The spelling of 21133242303 in words is "twenty-one billion, one hundred thirty-three million, two hundred forty-two thousand, three hundred three".