21044005052265 has 48 divisors (see below), whose sum is σ = 39501596272320. Its totient is φ = 10302247716480.

The previous prime is 21044005052209. The next prime is 21044005052281. The reversal of 21044005052265 is 56225050044012.

21044005052265 is a `hidden beast` number, since 2 + 104 + 40 + 0 + 505 + 2 + 2 + 6 + 5 = 666.

It is not a de Polignac number, because 21044005052265 - 2⁶ = 21044005052201 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100377571 + ... + 100587000.

It is an arithmetic number, because the mean of its divisors is an integer number (822949922340).

Almost surely, 2^{21044005052265} is an apocalyptic number.

It is an amenable number.

21044005052265 is a deficient number, since it is larger than the sum of its proper divisors (18457591220055).

21044005052265 is a wasteful number, since it uses less digits than its factorization.

21044005052265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200964774 (or 200964771 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

Adding to 21044005052265 its reverse (56225050044012), we get a palindrome (77269055096277).

The spelling of 21044005052265 in words is "twenty-one trillion, forty-four billion, five million, fifty-two thousand, two hundred sixty-five".