12011012211021 has 4 divisors (see below), whose sum is σ = 16014682948032. Its totient is φ = 8007341474012.

The previous prime is 12011012211007. The next prime is 12011012211049. The reversal of 12011012211021 is 12011221011021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12011012211021 - 2¹¹ = 12011012208973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011012211421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2001835368501 + ... + 2001835368506.

It is an arithmetic number, because the mean of its divisors is an integer number (4003670737008).

Almost surely, 2^{12011012211021} is an apocalyptic number.

It is an amenable number.

12011012211021 is a deficient number, since it is larger than the sum of its proper divisors (4003670737011).

12011012211021 is an equidigital number, since it uses as much as digits as its factorization.

12011012211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4003670737010.

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

Adding to 12011012211021 its reverse (12011221011021), we get a palindrome (24022233222042).

The spelling of 12011012211021 in words is "twelve trillion, eleven billion, twelve million, two hundred eleven thousand, twenty-one".