20011322111 has 4 divisors (see below), whose sum is σ = 21830533224. Its totient is φ = 18192111000.

The previous prime is 20011322053. The next prime is 20011322113. The reversal of 20011322111 is 11122311002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011322111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011322113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909605540 + ... + 909605561.

It is an arithmetic number, because the mean of its divisors is an integer number (5457633306).

Almost surely, 2^20011322111 is an apocalyptic number.

20011322111 is a deficient number, since it is larger than the sum of its proper divisors (1819211113).

20011322111 is a wasteful number, since it uses less digits than its factorization.

20011322111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819211112.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20011322111 its reverse (11122311002), we get a palindrome (31133633113).

It can be divided in two parts, 200 and 11322111, that added together give a palindrome (11322311).

The spelling of 20011322111 in words is "twenty billion, eleven million, three hundred twenty-two thousand, one hundred eleven".