21030450441 has 64 divisors (see below), whose sum is σ = 37679093760. Its totient is φ = 10076451840.

The previous prime is 21030450323. The next prime is 21030450473. The reversal of 21030450441 is 14405403012.

It is not a de Polignac number, because 21030450441 - 2¹⁴ = 21030434057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21030450481) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5622750 + ... + 5626488.

It is an arithmetic number, because the mean of its divisors is an integer number (588735840).

Almost surely, 2^21030450441 is an apocalyptic number.

21030450441 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21030450441 is a deficient number, since it is larger than the sum of its proper divisors (16648643319).

21030450441 is a wasteful number, since it uses less digits than its factorization.

21030450441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5646.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21030450441 its reverse (14405403012), we get a palindrome (35435853453).

The spelling of 21030450441 in words is "twenty-one billion, thirty million, four hundred fifty thousand, four hundred forty-one".