21040505005 has 32 divisors (see below), whose sum is σ = 28847599200. Its totient is φ = 14594506752.

The previous prime is 21040504999. The next prime is 21040505047. The reversal of 21040505005 is 50050504012.

It can be written as a sum of positive squares in 16 ways, for example, as 8165291044 + 12875213961 = 90362^2 + 113469^2 .

It is a cyclic number.

It is not a de Polignac number, because 21040505005 - 2³ = 21040504997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 543741 + ... + 581149.

It is an arithmetic number, because the mean of its divisors is an integer number (901487475).

Almost surely, 2^21040505005 is an apocalyptic number.

It is an amenable number.

21040505005 is a deficient number, since it is larger than the sum of its proper divisors (7807094195).

21040505005 is a wasteful number, since it uses less digits than its factorization.

21040505005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37953.

The product of its (nonzero) digits is 1000, while the sum is 22.

The spelling of 21040505005 in words is "twenty-one billion, forty million, five hundred five thousand, five".