12211111102021 has 4 divisors (see below), whose sum is σ = 13150427340652. Its totient is φ = 11271794863392.

The previous prime is 12211111101997. The next prime is 12211111102147. The reversal of 12211111102021 is 12020111111221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 536247179521 + 11674863922500 = 732289^2 + 3416850^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211111102021 - 2¹⁵ = 12211111069253 is a prime.

It is a super-2 number, since 2×12211111102021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12211111101986 and 12211111102004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211111103021) 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, 469658119296 + ... + 469658119321.

It is an arithmetic number, because the mean of its divisors is an integer number (3287606835163).

Almost surely, 2^{12211111102021} is an apocalyptic number.

It is an amenable number.

12211111102021 is a deficient number, since it is larger than the sum of its proper divisors (939316238631).

12211111102021 is an equidigital number, since it uses as much as digits as its factorization.

12211111102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939316238630.

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

Adding to 12211111102021 its reverse (12020111111221), we get a palindrome (24231222213242).

The spelling of 12211111102021 in words is "twelve trillion, two hundred eleven billion, one hundred eleven million, one hundred two thousand, twenty-one".