21040444534515 has 192 divisors, whose sum is σ = 40648886304768. Its totient is φ = 9258738048000.

The previous prime is 21040444534427. The next prime is 21040444534523. The reversal of 21040444534515 is 51543544404012.

It is not a de Polignac number, because 21040444534515 - 2⁷ = 21040444534387 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5303866062 + ... + 5303870028.

It is an arithmetic number, because the mean of its divisors is an integer number (211712949504).

Almost surely, 2^{21040444534515} is an apocalyptic number.

21040444534515 is a deficient number, since it is larger than the sum of its proper divisors (19608441770253).

21040444534515 is a wasteful number, since it uses less digits than its factorization.

21040444534515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6058 (or 6051 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 42.

Adding to 21040444534515 its reverse (51543544404012), we get a palindrome (72583988938527).

The spelling of 21040444534515 in words is "twenty-one trillion, forty billion, four hundred forty-four million, five hundred thirty-four thousand, five hundred fifteen".