20011222111 has 8 divisors (see below), whose sum is σ = 20341601280. Its totient is φ = 19682769912.

The previous prime is 20011222109. The next prime is 20011222139. The reversal of 20011222111 is 11122211002.

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 20011222111 - 2¹ = 20011222109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011222091 and 20011222100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011222141) 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, 460795 + ... + 502348.

It is an arithmetic number, because the mean of its divisors is an integer number (2542700160).

Almost surely, 2^20011222111 is an apocalyptic number.

20011222111 is a deficient number, since it is larger than the sum of its proper divisors (330379169).

20011222111 is an equidigital number, since it uses as much as digits as its factorization.

20011222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963485.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20011222111 its reverse (11122211002), we get a palindrome (31133433113).

The spelling of 20011222111 in words is "twenty billion, eleven million, two hundred twenty-two thousand, one hundred eleven".