21120920179 has 8 divisors (see below), whose sum is σ = 21421284192. Its totient is φ = 20820636480.

The previous prime is 21120920167. The next prime is 21120920209. The reversal of 21120920179 is 97102902112.

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 21120920179 - 2⁹ = 21120919667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120920879) 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, 683017 + ... + 713269.

It is an arithmetic number, because the mean of its divisors is an integer number (2677660524).

Almost surely, 2^21120920179 is an apocalyptic number.

21120920179 is a deficient number, since it is larger than the sum of its proper divisors (300364013).

21120920179 is an equidigital number, since it uses as much as digits as its factorization.

21120920179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40157.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 21120920179 in words is "twenty-one billion, one hundred twenty million, nine hundred twenty thousand, one hundred seventy-nine".