21019988095 has 4 divisors (see below), whose sum is σ = 25223985720. Its totient is φ = 16815990472.

The previous prime is 21019988081. The next prime is 21019988107. The reversal of 21019988095 is 59088991012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21019988095 - 2²⁹ = 20483117183 is a prime.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2101998805 + ... + 2101998814.

It is an arithmetic number, because the mean of its divisors is an integer number (6305996430).

Almost surely, 2^21019988095 is an apocalyptic number.

21019988095 is a deficient number, since it is larger than the sum of its proper divisors (4203997625).

21019988095 is an equidigital number, since it uses as much as digits as its factorization.

21019988095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4203997624.

The product of its (nonzero) digits is 466560, while the sum is 52.

The spelling of 21019988095 in words is "twenty-one billion, nineteen million, nine hundred eighty-eight thousand, ninety-five".