221122120212 has 48 divisors (see below), whose sum is σ = 655176654720. Its totient is φ = 63177748416.

The previous prime is 221122120207. The next prime is 221122120229. The reversal of 221122120212 is 212021221122.

It is a happy number.

221122120212 is a `hidden beast` number, since 2 + 211 + 221 + 20 + 212 = 666.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146244033 + ... + 146245544.

It is an arithmetic number, because the mean of its divisors is an integer number (13649513640).

Almost surely, 2^221122120212 is an apocalyptic number.

It is an amenable number.

221122120212 is an abundant number, since it is smaller than the sum of its proper divisors (434054534508).

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

221122120212 is a wasteful number, since it uses less digits than its factorization.

221122120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292489597 (or 292489589 counting only the distinct ones).

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

Adding to 221122120212 its reverse (212021221122), we get a palindrome (433143341334).

The spelling of 221122120212 in words is "two hundred twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, two hundred twelve".