12011111210021 has 48 divisors (see below), whose sum is σ = 15144511363968. Its totient is φ = 9324508786560.

The previous prime is 12011111209987. The next prime is 12011111210041. The reversal of 12011111210021 is 12001211111021.

It is not a de Polignac number, because 12011111210021 - 2³⁰ = 12010037468197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12011111209978 and 12011111210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011111210041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 363548915 + ... + 363581951.

It is an arithmetic number, because the mean of its divisors is an integer number (315510653416).

Almost surely, 2^{12011111210021} is an apocalyptic number.

12011111210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12011111210021 is a deficient number, since it is larger than the sum of its proper divisors (3133400153947).

12011111210021 is a wasteful number, since it uses less digits than its factorization.

12011111210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34650 (or 34639 counting only the distinct ones).

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

Adding to 12011111210021 its reverse (12001211111021), we get a palindrome (24012322321042).

The spelling of 12011111210021 in words is "twelve trillion, eleven billion, one hundred eleven million, two hundred ten thousand, twenty-one".