21443504045 has 16 divisors (see below), whose sum is σ = 25820726400. Its totient is φ = 17095848000.

The previous prime is 21443504041. The next prime is 21443504057. The reversal of 21443504045 is 54040534412.

It is not a de Polignac number, because 21443504045 - 2² = 21443504041 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443504041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5566370 + ... + 5570220.

It is an arithmetic number, because the mean of its divisors is an integer number (1613795400).

Almost surely, 2^21443504045 is an apocalyptic number.

It is an amenable number.

21443504045 is a deficient number, since it is larger than the sum of its proper divisors (4377222355).

21443504045 is a wasteful number, since it uses less digits than its factorization.

21443504045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7396.

The product of its (nonzero) digits is 38400, while the sum is 32.

The spelling of 21443504045 in words is "twenty-one billion, four hundred forty-three million, five hundred four thousand, forty-five".