12012111021021 has 16 divisors (see below), whose sum is σ = 16703239193088. Its totient is φ = 7669854720000.

The previous prime is 12012111020989. The next prime is 12012111021047. The reversal of 12012111021021 is 12012011121021.

It is a happy number.

It is not a de Polignac number, because 12012111021021 - 2⁵ = 12012111020989 is a prime.

It is a super-2 number, since 2×12012111021021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012111023021) 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, 665776980 + ... + 665795021.

It is an arithmetic number, because the mean of its divisors is an integer number (1043952449568).

Almost surely, 2^{12012111021021} is an apocalyptic number.

It is an amenable number.

12012111021021 is a deficient number, since it is larger than the sum of its proper divisors (4691128172067).

12012111021021 is a wasteful number, since it uses less digits than its factorization.

12012111021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331572132.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 12012111021021 its reverse (12012011121021), we get a palindrome (24024122142042).

The spelling of 12012111021021 in words is "twelve trillion, twelve billion, one hundred eleven million, twenty-one thousand, twenty-one".