21320011191 has 8 divisors (see below), whose sum is σ = 28429759600. Its totient is φ = 14211801792.

The previous prime is 21320011189. The next prime is 21320011201. The reversal of 21320011191 is 19111002312.

It is a happy number.

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

It is not a de Polignac number, because 21320011191 - 2¹ = 21320011189 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 (21320011291) 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, 352030 + ... + 408123.

It is an arithmetic number, because the mean of its divisors is an integer number (3553719950).

Almost surely, 2^21320011191 is an apocalyptic number.

21320011191 is a deficient number, since it is larger than the sum of its proper divisors (7109748409).

21320011191 is an equidigital number, since it uses as much as digits as its factorization.

21320011191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769505.

The product of its (nonzero) digits is 108, while the sum is 21.

The spelling of 21320011191 in words is "twenty-one billion, three hundred twenty million, eleven thousand, one hundred ninety-one".