11221021201212 has 72 divisors (see below), whose sum is σ = 29841358000272. Its totient is φ = 3550487904000.

The previous prime is 11221021201157. The next prime is 11221021201223. The reversal of 11221021201212 is 21210212012211.

11221021201212 is a `hidden beast` number, since 11 + 221 + 0 + 21 + 201 + 212 = 666.

It is a super-2 number, since 2×11221021201212² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102679414 + ... + 102788637.

Almost surely, 2^{11221021201212} is an apocalyptic number.

11221021201212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11221021201212 is an abundant number, since it is smaller than the sum of its proper divisors (18620336799060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11221021201212 is a wasteful number, since it uses less digits than its factorization.

11221021201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205468139 (or 205468134 counting only the distinct ones).

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

Adding to 11221021201212 its reverse (21210212012211), we get a palindrome (32431233213423).

The spelling of 11221021201212 in words is "eleven trillion, two hundred twenty-one billion, twenty-one million, two hundred one thousand, two hundred twelve".