12011212120021 has 16 divisors (see below), whose sum is σ = 12754813454208. Its totient is φ = 11271774131200.

The previous prime is 12011212120003. The next prime is 12011212120079. The reversal of 12011212120021 is 12002121211021.

It is a cyclic number.

It is not a de Polignac number, because 12011212120021 - 2⁵ = 12011212119989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011212119977 and 12011212120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011212120001) 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, 7719816 + ... + 9144286.

It is an arithmetic number, because the mean of its divisors is an integer number (797175840888).

Almost surely, 2^{12011212120021} is an apocalyptic number.

It is an amenable number.

12011212120021 is a deficient number, since it is larger than the sum of its proper divisors (743601334187).

12011212120021 is a wasteful number, since it uses less digits than its factorization.

12011212120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425932.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12011212120021 its reverse (12002121211021), we get a palindrome (24013333331042).

The spelling of 12011212120021 in words is "twelve trillion, eleven billion, two hundred twelve million, one hundred twenty thousand, twenty-one".