12012021111 has 8 divisors (see below), whose sum is σ = 16016673024. Its totient is φ = 8007691640.

The previous prime is 12012021107. The next prime is 12012021113. The reversal of 12012021111 is 11112021021.

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 12012021111 - 2² = 12012021107 is a prime.

It is a super-2 number, since 2×12012021111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012021113) 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, 26740 + ... + 157286.

It is an arithmetic number, because the mean of its divisors is an integer number (2002084128).

Almost surely, 2^12012021111 is an apocalyptic number.

12012021111 is a deficient number, since it is larger than the sum of its proper divisors (4004651913).

12012021111 is a wasteful number, since it uses less digits than its factorization.

12012021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161221.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12012021111 its reverse (11112021021), we get a palindrome (23124042132).

The spelling of 12012021111 in words is "twelve billion, twelve million, twenty-one thousand, one hundred eleven".