21112502555 has 16 divisors (see below), whose sum is σ = 28237157280. Its totient is φ = 15059814912.

The previous prime is 21112502531. The next prime is 21112502563. The reversal of 21112502555 is 55520521112.

It is a cyclic number.

It is not a de Polignac number, because 21112502555 - 2⁶ = 21112502491 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6534764 + ... + 6537993.

It is an arithmetic number, because the mean of its divisors is an integer number (1764822330).

Almost surely, 2^21112502555 is an apocalyptic number.

21112502555 is a deficient number, since it is larger than the sum of its proper divisors (7124654725).

21112502555 is a wasteful number, since it uses less digits than its factorization.

21112502555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13072798.

The product of its (nonzero) digits is 5000, while the sum is 29.

The spelling of 21112502555 in words is "twenty-one billion, one hundred twelve million, five hundred two thousand, five hundred fifty-five".