21444203233 has 4 divisors (see below), whose sum is σ = 21445262788. Its totient is φ = 21443143680.

The previous prime is 21444203213. The next prime is 21444203237. The reversal of 21444203233 is 33230244412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13611422224 + 7832781009 = 116668^2 + 88503^2 .

It is a cyclic number.

It is not a de Polignac number, because 21444203233 - 2¹⁷ = 21444072161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444203237) 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, 498816 + ... + 540097.

It is an arithmetic number, because the mean of its divisors is an integer number (5361315697).

Almost surely, 2^21444203233 is an apocalyptic number.

It is an amenable number.

21444203233 is a deficient number, since it is larger than the sum of its proper divisors (1059555).

21444203233 is a wasteful number, since it uses less digits than its factorization.

21444203233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059554.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21444203233 its reverse (33230244412), we get a palindrome (54674447645).

The spelling of 21444203233 in words is "twenty-one billion, four hundred forty-four million, two hundred three thousand, two hundred thirty-three".