12111201010021 has 4 divisors (see below), whose sum is σ = 12264507352000. Its totient is φ = 11957894668044.

The previous prime is 12111201009997. The next prime is 12111201010037. The reversal of 12111201010021 is 12001010211121.

It is a happy number.

12111201010021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12111201010021 - 2¹³ = 12111201001829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111201009983 and 12111201010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111201010061) 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, 76653170871 + ... + 76653171028.

It is an arithmetic number, because the mean of its divisors is an integer number (3066126838000).

Almost surely, 2^{12111201010021} is an apocalyptic number.

It is an amenable number.

12111201010021 is a deficient number, since it is larger than the sum of its proper divisors (153306341979).

12111201010021 is an equidigital number, since it uses as much as digits as its factorization.

12111201010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153306341978.

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

Adding to 12111201010021 its reverse (12001010211121), we get a palindrome (24112211221142).

The spelling of 12111201010021 in words is "twelve trillion, one hundred eleven billion, two hundred one million, ten thousand, twenty-one".