12111100121021 has 16 divisors (see below), whose sum is σ = 13907711054400. Its totient is φ = 10430441798400.

The previous prime is 12111100120939. The next prime is 12111100121023. The reversal of 12111100121021 is 12012100111121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111100121021 is a prime.

It is a super-2 number, since 2×12111100121021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12111100120987 and 12111100121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111100121023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13274981 + ... + 14157941.

It is an arithmetic number, because the mean of its divisors is an integer number (869231940900).

Almost surely, 2^{12111100121021} is an apocalyptic number.

12111100121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12111100121021 is a deficient number, since it is larger than the sum of its proper divisors (1796610933379).

12111100121021 is a wasteful number, since it uses less digits than its factorization.

12111100121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948620.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 12111100121021 its reverse (12012100111121), we get a palindrome (24123200232142).

The spelling of 12111100121021 in words is "twelve trillion, one hundred eleven billion, one hundred million, one hundred twenty-one thousand, twenty-one".