21203331233 has 4 divisors (see below), whose sum is σ = 24232378560. Its totient is φ = 18174283908.

The previous prime is 21203331221. The next prime is 21203331239. The reversal of 21203331233 is 33213330212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21203331233 - 2¹² = 21203327137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21203331199 and 21203331208.

It is not an unprimeable number, because it can be changed into a prime (21203331239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1514523653 + ... + 1514523666.

It is an arithmetic number, because the mean of its divisors is an integer number (6058094640).

Almost surely, 2^21203331233 is an apocalyptic number.

It is an amenable number.

21203331233 is a deficient number, since it is larger than the sum of its proper divisors (3029047327).

21203331233 is an equidigital number, since it uses as much as digits as its factorization.

21203331233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3029047326.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21203331233 its reverse (33213330212), we get a palindrome (54416661445).

The spelling of 21203331233 in words is "twenty-one billion, two hundred three million, three hundred thirty-one thousand, two hundred thirty-three".