20320111221 has 8 divisors (see below), whose sum is σ = 27114670080. Its totient is φ = 13536146592.

The previous prime is 20320111187. The next prime is 20320111249. The reversal of 20320111221 is 12211102302.

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

It is not a de Polignac number, because 20320111221 - 2⁶ = 20320111157 is a prime.

It is a super-2 number, since 2×20320111221² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20320111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320111421) 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, 2644080 + ... + 2651753.

It is an arithmetic number, because the mean of its divisors is an integer number (3389333760).

Almost surely, 2^20320111221 is an apocalyptic number.

It is an amenable number.

20320111221 is a deficient number, since it is larger than the sum of its proper divisors (6794558859).

20320111221 is a wasteful number, since it uses less digits than its factorization.

20320111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5297115.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20320111221 its reverse (12211102302), we get a palindrome (32531213523).

The spelling of 20320111221 in words is "twenty billion, three hundred twenty million, one hundred eleven thousand, two hundred twenty-one".