21003453050444 has 6 divisors (see below), whose sum is σ = 36756042838284. Its totient is φ = 10501726525220.

The previous prime is 21003453050441. The next prime is 21003453050449. The reversal of 21003453050444 is 44405035430012.

It is a super-2 number, since 2×21003453050444² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003453050441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625431631302 + ... + 2625431631309.

It is an arithmetic number, because the mean of its divisors is an integer number (6126007139714).

Almost surely, 2^{21003453050444} is an apocalyptic number.

It is an amenable number.

21003453050444 is a deficient number, since it is larger than the sum of its proper divisors (15752589787840).

21003453050444 is a wasteful number, since it uses less digits than its factorization.

21003453050444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250863262615 (or 5250863262613 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 21003453050444 its reverse (44405035430012), we get a palindrome (65408488480456).

The spelling of 21003453050444 in words is "twenty-one trillion, three billion, four hundred fifty-three million, fifty thousand, four hundred forty-four".