23121010111 has 8 divisors (see below), whose sum is σ = 24393353600. Its totient is φ = 21854211480.

The previous prime is 23121010103. The next prime is 23121010127. The reversal of 23121010111 is 11101012132.

It is a happy number.

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 23121010111 - 2³ = 23121010103 is a prime.

It is a super-2 number, since 2×23121010111² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23121010091 and 23121010100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121010411) 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, 1377645 + ... + 1394326.

It is an arithmetic number, because the mean of its divisors is an integer number (3049169200).

Almost surely, 2^23121010111 is an apocalyptic number.

23121010111 is a deficient number, since it is larger than the sum of its proper divisors (1272343489).

23121010111 is a wasteful number, since it uses less digits than its factorization.

23121010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2772429.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 23121010111 its reverse (11101012132), we get a palindrome (34222022243).

The spelling of 23121010111 in words is "twenty-three billion, one hundred twenty-one million, ten thousand, one hundred eleven".