11221220211012 has 120 divisors (see below), whose sum is σ = 34093349949120. Its totient is φ = 3151722830400.

The previous prime is 11221220211011. The next prime is 11221220211073. The reversal of 11221220211012 is 21011202212211.

11221220211012 is a `hidden beast` number, since 1 + 1 + 221 + 220 + 211 + 0 + 12 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (11221220211011) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 41795239 + ... + 42062862.

It is an arithmetic number, because the mean of its divisors is an integer number (284111249576).

Almost surely, 2^{11221220211012} is an apocalyptic number.

11221220211012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11221220211012 is an abundant number, since it is smaller than the sum of its proper divisors (22872129738108).

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

11221220211012 is a wasteful number, since it uses less digits than its factorization.

11221220211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83858183 (or 83858172 counting only the distinct ones).

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

Adding to 11221220211012 its reverse (21011202212211), we get a palindrome (32232422423223).

The spelling of 11221220211012 in words is "eleven trillion, two hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, twelve".