21133203243 has 4 divisors (see below), whose sum is σ = 28177604328. Its totient is φ = 14088802160.

The previous prime is 21133203211. The next prime is 21133203269. The reversal of 21133203243 is 34230233112.

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 21133203243 - 2⁵ = 21133203211 is a prime.

It is a super-2 number, since 2×21133203243² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21133203043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3522200538 + ... + 3522200543.

It is an arithmetic number, because the mean of its divisors is an integer number (7044401082).

Almost surely, 2^21133203243 is an apocalyptic number.

21133203243 is a deficient number, since it is larger than the sum of its proper divisors (7044401085).

21133203243 is an equidigital number, since it uses as much as digits as its factorization.

21133203243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044401084.

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

Adding to 21133203243 its reverse (34230233112), we get a palindrome (55363436355).

The spelling of 21133203243 in words is "twenty-one billion, one hundred thirty-three million, two hundred three thousand, two hundred forty-three".