11212210012221 has 24 divisors (see below), whose sum is σ = 16635108191520. Its totient is φ = 7271919200736.

The previous prime is 11212210012187. The next prime is 11212210012229. The reversal of 11212210012221 is 12221001221211.

11212210012221 is a `hidden beast` number, since 11 + 212 + 210 + 0 + 12 + 221 = 666.

It is not a de Polignac number, because 11212210012221 - 2³¹ = 11210062528573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11212210012194 and 11212210012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212210012229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 803866 + ... + 4803188.

It is an arithmetic number, because the mean of its divisors is an integer number (693129507980).

Almost surely, 2^{11212210012221} is an apocalyptic number.

It is an amenable number.

11212210012221 is a deficient number, since it is larger than the sum of its proper divisors (5422898179299).

11212210012221 is a wasteful number, since it uses less digits than its factorization.

11212210012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007785 (or 4007782 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11212210012221 its reverse (12221001221211), we get a palindrome (23433211233432).

The spelling of 11212210012221 in words is "eleven trillion, two hundred twelve billion, two hundred ten million, twelve thousand, two hundred twenty-one".