21144526191 has 12 divisors (see below), whose sum is σ = 31287023040. Its totient is φ = 13752537120.

The previous prime is 21144526187. The next prime is 21144526231. The reversal of 21144526191 is 19162544112.

21144526191 is a `hidden beast` number, since 2 + 1 + 1 + 44 + 526 + 1 + 91 = 666.

It is not a de Polignac number, because 21144526191 - 2² = 21144526187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144526171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28650751 + ... + 28651488.

It is an arithmetic number, because the mean of its divisors is an integer number (2607251920).

Almost surely, 2^21144526191 is an apocalyptic number.

21144526191 is a deficient number, since it is larger than the sum of its proper divisors (10142496849).

21144526191 is a wasteful number, since it uses less digits than its factorization.

21144526191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57302286 (or 57302283 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The spelling of 21144526191 in words is "twenty-one billion, one hundred forty-four million, five hundred twenty-six thousand, one hundred ninety-one".