21071027091 has 8 divisors (see below), whose sum is σ = 28095376320. Its totient is φ = 14047014632.

The previous prime is 21071027071. The next prime is 21071027093. The reversal of 21071027091 is 19072017012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21071027091 - 2⁹ = 21071026579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21071027093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182380 + ... + 274598.

It is an arithmetic number, because the mean of its divisors is an integer number (3511922040).

Almost surely, 2^21071027091 is an apocalyptic number.

21071027091 is a deficient number, since it is larger than the sum of its proper divisors (7024349229).

21071027091 is an equidigital number, since it uses as much as digits as its factorization.

21071027091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168385.

The product of its (nonzero) digits is 1764, while the sum is 30.

The spelling of 21071027091 in words is "twenty-one billion, seventy-one million, twenty-seven thousand, ninety-one".