21243333445 has 16 divisors (see below), whose sum is σ = 25915253760. Its totient is φ = 16714174464.

The previous prime is 21243333427. The next prime is 21243333487. The reversal of 21243333445 is 54433334212.

It is a cyclic number.

It is not a de Polignac number, because 21243333445 - 2⁷ = 21243333317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21243333445.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3117 + ... + 206146.

It is an arithmetic number, because the mean of its divisors is an integer number (1619703360).

Almost surely, 2^21243333445 is an apocalyptic number.

It is an amenable number.

21243333445 is a deficient number, since it is larger than the sum of its proper divisors (4671920315).

21243333445 is a wasteful number, since it uses less digits than its factorization.

21243333445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209604.

The product of its digits is 103680, while the sum is 34.

Adding to 21243333445 its reverse (54433334212), we get a palindrome (75676667657).

The spelling of 21243333445 in words is "twenty-one billion, two hundred forty-three million, three hundred thirty-three thousand, four hundred forty-five".