21044041505 has 16 divisors (see below), whose sum is σ = 25921582848. Its totient is φ = 16391088000.

The previous prime is 21044041453. The next prime is 21044041531. The reversal of 21044041505 is 50514044012.

It is not a de Polignac number, because 21044041505 - 2⁶ = 21044041441 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3881 + ... + 205190.

It is an arithmetic number, because the mean of its divisors is an integer number (1620098928).

Almost surely, 2^21044041505 is an apocalyptic number.

It is an amenable number.

21044041505 is a deficient number, since it is larger than the sum of its proper divisors (4877541343).

21044041505 is a wasteful number, since it uses less digits than its factorization.

21044041505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209608.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 21044041505 its reverse (50514044012), we get a palindrome (71558085517).

The spelling of 21044041505 in words is "twenty-one billion, forty-four million, forty-one thousand, five hundred five".