12111221122021 has 4 divisors (see below), whose sum is σ = 13841395568032. Its totient is φ = 10381046676012.

The previous prime is 12111221122019. The next prime is 12111221122069. The reversal of 12111221122021 is 12022112211121.

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 12111221122021 - 2¹ = 12111221122019 is a prime.

It is a super-2 number, since 2×12111221122021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12111221122021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111221125021) 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, 865087222995 + ... + 865087223008.

It is an arithmetic number, because the mean of its divisors is an integer number (3460348892008).

Almost surely, 2^{12111221122021} is an apocalyptic number.

It is an amenable number.

12111221122021 is a deficient number, since it is larger than the sum of its proper divisors (1730174446011).

12111221122021 is an equidigital number, since it uses as much as digits as its factorization.

12111221122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730174446010.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12111221122021 its reverse (12022112211121), we get a palindrome (24133333333142).

The spelling of 12111221122021 in words is "twelve trillion, one hundred eleven billion, two hundred twenty-one million, one hundred twenty-two thousand, twenty-one".