20101222111 has 8 divisors (see below), whose sum is σ = 20388630960. Its totient is φ = 19814139072.

The previous prime is 20101222051. The next prime is 20101222129. The reversal of 20101222111 is 11122210102.

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 20101222111 - 2⁷ = 20101221983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101222091 and 20101222100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101222171) 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, 44196 + ... + 205318.

It is an arithmetic number, because the mean of its divisors is an integer number (2548578870).

Almost surely, 2^20101222111 is an apocalyptic number.

20101222111 is a deficient number, since it is larger than the sum of its proper divisors (287408849).

20101222111 is a wasteful number, since it uses less digits than its factorization.

20101222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162905.

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

Adding to 20101222111 its reverse (11122210102), we get a palindrome (31223432213).

The spelling of 20101222111 in words is "twenty billion, one hundred one million, two hundred twenty-two thousand, one hundred eleven".