20321211111 has 8 divisors (see below), whose sum is σ = 27476567424. Its totient is φ = 13356664440.

The previous prime is 20321211059. The next prime is 20321211143. The reversal of 20321211111 is 11111212302.

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

It is a de Polignac number, because none of the positive numbers 2^k-20321211111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321211181) 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, 47702161 + ... + 47702586.

It is an arithmetic number, because the mean of its divisors is an integer number (3434570928).

Almost surely, 2^20321211111 is an apocalyptic number.

20321211111 is a deficient number, since it is larger than the sum of its proper divisors (7155356313).

20321211111 is an equidigital number, since it uses as much as digits as its factorization.

20321211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95404821.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 20321211111 its reverse (11111212302), we get a palindrome (31432423413).

The spelling of 20321211111 in words is "twenty billion, three hundred twenty-one million, two hundred eleven thousand, one hundred eleven".