20113223111 has 4 divisors (see below), whose sum is σ = 20115571272. Its totient is φ = 20110874952.

The previous prime is 20113223101. The next prime is 20113223171. The reversal of 20113223111 is 11132231102.

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

It is a cyclic number.

It is not a de Polignac number, because 20113223111 - 2³⁰ = 19039481287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20113223111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113223101) 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, 1161185 + ... + 1178378.

It is an arithmetic number, because the mean of its divisors is an integer number (5028892818).

Almost surely, 2^20113223111 is an apocalyptic number.

20113223111 is a deficient number, since it is larger than the sum of its proper divisors (2348161).

20113223111 is an equidigital number, since it uses as much as digits as its factorization.

20113223111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348160.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20113223111 its reverse (11132231102), we get a palindrome (31245454213).

The spelling of 20113223111 in words is "twenty billion, one hundred thirteen million, two hundred twenty-three thousand, one hundred eleven".