21003444420233 has 4 divisors (see below), whose sum is σ = 22912848458448. Its totient is φ = 19094040382020.

The previous prime is 21003444420223. The next prime is 21003444420271. The reversal of 21003444420233 is 33202444430012.

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 21003444420233 - 2²⁴ = 21003427643017 is a prime.

It is a super-2 number, since 2×21003444420233² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21003444420233.

It is not an unprimeable number, because it can be changed into a prime (21003444420223) 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, 954702019091 + ... + 954702019112.

It is an arithmetic number, because the mean of its divisors is an integer number (5728212114612).

Almost surely, 2^{21003444420233} is an apocalyptic number.

It is an amenable number.

21003444420233 is a deficient number, since it is larger than the sum of its proper divisors (1909404038215).

21003444420233 is a wasteful number, since it uses less digits than its factorization.

21003444420233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909404038214.

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 21003444420233 its reverse (33202444430012), we get a palindrome (54205888850245).

The spelling of 21003444420233 in words is "twenty-one trillion, three billion, four hundred forty-four million, four hundred twenty thousand, two hundred thirty-three".