21584041291 has 4 divisors (see below), whose sum is σ = 21629102400. Its totient is φ = 21538980184.

The previous prime is 21584041289. The next prime is 21584041319. The reversal of 21584041291 is 19214048512.

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 21584041291 - 2¹ = 21584041289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21584041291.

It is not an unprimeable number, because it can be changed into a prime (21584044291) 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, 22529836 + ... + 22530793.

It is an arithmetic number, because the mean of its divisors is an integer number (5407275600).

Almost surely, 2^21584041291 is an apocalyptic number.

21584041291 is a deficient number, since it is larger than the sum of its proper divisors (45061109).

21584041291 is an equidigital number, since it uses as much as digits as its factorization.

21584041291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45061108.

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 21584041291 in words is "twenty-one billion, five hundred eighty-four million, forty-one thousand, two hundred ninety-one".