21890575195 has 4 divisors (see below), whose sum is σ = 26268690240. Its totient is φ = 17512460152.

The previous prime is 21890575183. The next prime is 21890575219. The reversal of 21890575195 is 59157509812.

It is a happy number.

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 21890575195 - 2¹¹ = 21890573147 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 3 ways as a sum of consecutive naturals, for example, 2189057515 + ... + 2189057524.

It is an arithmetic number, because the mean of its divisors is an integer number (6567172560).

Almost surely, 2^21890575195 is an apocalyptic number.

21890575195 is a deficient number, since it is larger than the sum of its proper divisors (4378115045).

21890575195 is an equidigital number, since it uses as much as digits as its factorization.

21890575195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4378115044.

The product of its (nonzero) digits is 1134000, while the sum is 52.

The spelling of 21890575195 in words is "twenty-one billion, eight hundred ninety million, five hundred seventy-five thousand, one hundred ninety-five".