21635229105187 has 16 divisors (see below), whose sum is σ = 22020289320960. Its totient is φ = 21250785578400.

The previous prime is 21635229105107. The next prime is 21635229105209. The reversal of 21635229105187 is 78150192253612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21635229105187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21635229105107) 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, 713477208 + ... + 713507530.

It is an arithmetic number, because the mean of its divisors is an integer number (1376268082560).

Almost surely, 2^{21635229105187} is an apocalyptic number.

21635229105187 is a deficient number, since it is larger than the sum of its proper divisors (385060215773).

21635229105187 is a wasteful number, since it uses less digits than its factorization.

21635229105187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40074.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 21635229105187 in words is "twenty-one trillion, six hundred thirty-five billion, two hundred twenty-nine million, one hundred five thousand, one hundred eighty-seven".