21003234032444 has 6 divisors (see below), whose sum is σ = 36755659556784. Its totient is φ = 10501617016220.

The previous prime is 21003234032383. The next prime is 21003234032471. The reversal of 21003234032444 is 44423043230012.

It is a super-2 number, since 2×21003234032444² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003234032444.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625404254052 + ... + 2625404254059.

It is an arithmetic number, because the mean of its divisors is an integer number (6125943259464).

Almost surely, 2^{21003234032444} is an apocalyptic number.

It is an amenable number.

21003234032444 is a deficient number, since it is larger than the sum of its proper divisors (15752425524340).

21003234032444 is a wasteful number, since it uses less digits than its factorization.

21003234032444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250808508115 (or 5250808508113 counting only the distinct ones).

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

Adding to 21003234032444 its reverse (44423043230012), we get a palindrome (65426277262456).

The spelling of 21003234032444 in words is "twenty-one trillion, three billion, two hundred thirty-four million, thirty-two thousand, four hundred forty-four".