12221100211021 has 4 divisors (see below), whose sum is σ = 13161184842652. Its totient is φ = 11281015579392.

The previous prime is 12221100211003. The next prime is 12221100211037. The reversal of 12221100211021 is 12011200112221.

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 4950602750025 + 7270497460996 = 2224995^2 + 2696386^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12221100211021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221100210986 and 12221100211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221100211081) 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, 470042315796 + ... + 470042315821.

It is an arithmetic number, because the mean of its divisors is an integer number (3290296210663).

Almost surely, 2^{12221100211021} is an apocalyptic number.

It is an amenable number.

12221100211021 is a deficient number, since it is larger than the sum of its proper divisors (940084631631).

12221100211021 is an equidigital number, since it uses as much as digits as its factorization.

12221100211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940084631630.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12221100211021 its reverse (12011200112221), we get a palindrome (24232300323242).

The spelling of 12221100211021 in words is "twelve trillion, two hundred twenty-one billion, one hundred million, two hundred eleven thousand, twenty-one".