21234333445 has 32 divisors (see below), whose sum is σ = 27695001600. Its totient is φ = 15536305920.

The previous prime is 21234333437. The next prime is 21234333451. The reversal of 21234333445 is 54433343212.

It is not a de Polignac number, because 21234333445 - 2³ = 21234333437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21234333445.

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 31 ways as a sum of consecutive naturals, for example, 4171692 + ... + 4176778.

It is an arithmetic number, because the mean of its divisors is an integer number (865468800).

Almost surely, 2^21234333445 is an apocalyptic number.

It is an amenable number.

21234333445 is a deficient number, since it is larger than the sum of its proper divisors (6460668155).

21234333445 is a wasteful number, since it uses less digits than its factorization.

21234333445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5685.

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

Adding to 21234333445 its reverse (54433343212), we get a palindrome (75667676657).

The spelling of 21234333445 in words is "twenty-one billion, two hundred thirty-four million, three hundred thirty-three thousand, four hundred forty-five".