221122122012 has 36 divisors (see below), whose sum is σ = 609761004216. Its totient is φ = 67006703520.

The previous prime is 221122122007. The next prime is 221122122019. The reversal of 221122122012 is 210221221122.

It is a happy number.

221122122012 is a `hidden beast` number, since 2 + 211 + 221 + 220 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221122122019) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 279194203 + ... + 279194994.

Almost surely, 2^221122122012 is an apocalyptic number.

221122122012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221122122012 is an abundant number, since it is smaller than the sum of its proper divisors (388638882204).

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

221122122012 is a wasteful number, since it uses less digits than its factorization.

221122122012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558389218 (or 558389213 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221122122012 its reverse (210221221122), we get a palindrome (431343343134).

The spelling of 221122122012 in words is "two hundred twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, twelve".