11212202211221 has 4 divisors (see below), whose sum is σ = 12231493321344. Its totient is φ = 10192911101100.

The previous prime is 11212202211209. The next prime is 11212202211233. The reversal of 11212202211221 is 12211220221211.

11212202211221 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 an interprime number because it is at equal distance from previous prime (11212202211209) and next prime (11212202211233).

It is a cyclic number.

It is not a de Polignac number, because 11212202211221 - 2³⁰ = 11211128469397 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11212202211193 and 11212202211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212202241221) 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, 509645555045 + ... + 509645555066.

It is an arithmetic number, because the mean of its divisors is an integer number (3057873330336).

Almost surely, 2^{11212202211221} is an apocalyptic number.

11212202211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11212202211221 is a deficient number, since it is larger than the sum of its proper divisors (1019291110123).

11212202211221 is a wasteful number, since it uses less digits than its factorization.

11212202211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019291110122.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11212202211221 its reverse (12211220221211), we get a palindrome (23423422432432).

The spelling of 11212202211221 in words is "eleven trillion, two hundred twelve billion, two hundred two million, two hundred eleven thousand, two hundred twenty-one".