12021000121111 has 8 divisors (see below), whose sum is σ = 12728149192080. Its totient is φ = 11313854540928.

The previous prime is 12021000121073. The next prime is 12021000121127. The reversal of 12021000121111 is 11112100012021.

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 12021000121111 - 2⁹ = 12021000120599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021000121091 and 12021000121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021000121171) 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, 10315185 + ... + 11421253.

It is an arithmetic number, because the mean of its divisors is an integer number (1591018649010).

Almost surely, 2^{12021000121111} is an apocalyptic number.

12021000121111 is a deficient number, since it is larger than the sum of its proper divisors (707149070969).

12021000121111 is a wasteful number, since it uses less digits than its factorization.

12021000121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745393.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12021000121111 its reverse (11112100012021), we get a palindrome (23133100133132).

The spelling of 12021000121111 in words is "twelve trillion, twenty-one billion, one hundred twenty-one thousand, one hundred eleven".