21043413045 has 48 divisors (see below), whose sum is σ = 38437439040. Its totient is φ = 10620709632.

The previous prime is 21043413019. The next prime is 21043413077. The reversal of 21043413045 is 54031434012.

It is a happy number.

21043413045 is a `hidden beast` number, since 2 + 10 + 4 + 341 + 304 + 5 = 666.

It is not a de Polignac number, because 21043413045 - 2⁶ = 21043412981 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 788002 + ... + 814268.

It is an arithmetic number, because the mean of its divisors is an integer number (800779980).

Almost surely, 2^21043413045 is an apocalyptic number.

It is an amenable number.

21043413045 is a deficient number, since it is larger than the sum of its proper divisors (17394025995).

21043413045 is a wasteful number, since it uses less digits than its factorization.

21043413045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27234 (or 27231 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21043413045 its reverse (54031434012), we get a palindrome (75074847057).

The spelling of 21043413045 in words is "twenty-one billion, forty-three million, four hundred thirteen thousand, forty-five".