21444504032545 has 16 divisors (see below), whose sum is σ = 28139804844480. Its totient is φ = 15558780952000.

The previous prime is 21444504032431. The next prime is 21444504032573. The reversal of 21444504032545 is 54523040544412.

It is not a de Polignac number, because 21444504032545 - 2³¹ = 21442356548897 is a prime.

It is a super-3 number, since 3×21444504032545³ (a number of 41 digits) contains 333 as substring.

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, 465251506 + ... + 465297595.

It is an arithmetic number, because the mean of its divisors is an integer number (1758737802780).

Almost surely, 2^{21444504032545} is an apocalyptic number.

It is an amenable number.

21444504032545 is a deficient number, since it is larger than the sum of its proper divisors (6695300811935).

21444504032545 is a wasteful number, since it uses less digits than its factorization.

21444504032545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930549536.

The product of its (nonzero) digits is 1536000, while the sum is 43.

Adding to 21444504032545 its reverse (54523040544412), we get a palindrome (75967544576957).

The spelling of 21444504032545 in words is "twenty-one trillion, four hundred forty-four billion, five hundred four million, thirty-two thousand, five hundred forty-five".