21505055500502 has 32 divisors (see below), whose sum is σ = 36882412985088. Its totient is φ = 9212302113696.

The previous prime is 21505055500499. The next prime is 21505055500507. The reversal of 21505055500502 is 20500555050512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21505055500507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 605639033 + ... + 605674539.

It is an arithmetic number, because the mean of its divisors is an integer number (1152575405784).

Almost surely, 2^{21505055500502} is an apocalyptic number.

21505055500502 is a deficient number, since it is larger than the sum of its proper divisors (15377357484586).

21505055500502 is a wasteful number, since it uses less digits than its factorization.

21505055500502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53780.

The product of its (nonzero) digits is 62500, while the sum is 35.

The spelling of 21505055500502 in words is "twenty-one trillion, five hundred five billion, fifty-five million, five hundred thousand, five hundred two".