21292786608191 has 4 divisors (see below), whose sum is σ = 24334613266512. Its totient is φ = 18250959949872.

The previous prime is 21292786608167. The next prime is 21292786608229. The reversal of 21292786608191 is 19180668729212.

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 21292786608191 - 2¹⁴ = 21292786591807 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 (21292786605191) 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, 1520913329150 + ... + 1520913329163.

It is an arithmetic number, because the mean of its divisors is an integer number (6083653316628).

Almost surely, 2^{21292786608191} is an apocalyptic number.

21292786608191 is a deficient number, since it is larger than the sum of its proper divisors (3041826658321).

21292786608191 is an equidigital number, since it uses as much as digits as its factorization.

21292786608191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3041826658320.

The product of its (nonzero) digits is 10450944, while the sum is 62.

The spelling of 21292786608191 in words is "twenty-one trillion, two hundred ninety-two billion, seven hundred eighty-six million, six hundred eight thousand, one hundred ninety-one".