20323121111 has 4 divisors (see below), whose sum is σ = 20371625400. Its totient is φ = 20274616824.

The previous prime is 20323121041. The next prime is 20323121113. The reversal of 20323121111 is 11112132302.

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 20323121111 - 2²² = 20318926807 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 20323121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323121113) 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, 24251516 + ... + 24252353.

It is an arithmetic number, because the mean of its divisors is an integer number (5092906350).

Almost surely, 2^20323121111 is an apocalyptic number.

20323121111 is a deficient number, since it is larger than the sum of its proper divisors (48504289).

20323121111 is an equidigital number, since it uses as much as digits as its factorization.

20323121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48504288.

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

Adding to 20323121111 its reverse (11112132302), we get a palindrome (31435253413).

The spelling of 20323121111 in words is "twenty billion, three hundred twenty-three million, one hundred twenty-one thousand, one hundred eleven".