21522814512191 has 4 divisors (see below), whose sum is σ = 21522874523232. Its totient is φ = 21522754501152.

The previous prime is 21522814512187. The next prime is 21522814512229. The reversal of 21522814512191 is 19121541822512.

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 21522814512191 - 2² = 21522814512187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522814514191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29464295 + ... + 30185928.

It is an arithmetic number, because the mean of its divisors is an integer number (5380718630808).

Almost surely, 2^{21522814512191} is an apocalyptic number.

21522814512191 is a deficient number, since it is larger than the sum of its proper divisors (60011041).

21522814512191 is an equidigital number, since it uses as much as digits as its factorization.

21522814512191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60011040.

The product of its digits is 115200, while the sum is 44.

The spelling of 21522814512191 in words is "twenty-one trillion, five hundred twenty-two billion, eight hundred fourteen million, five hundred twelve thousand, one hundred ninety-one".