221200120212 has 24 divisors (see below), whose sum is σ = 516605861856. Its totient is φ = 73665909408.

The previous prime is 221200120151. The next prime is 221200120241. The reversal of 221200120212 is 212021002122.

It is a junction number, because it is equal to n+sod(n) for n = 221200120191 and 221200120200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8419338 + ... + 8445569.

It is an arithmetic number, because the mean of its divisors is an integer number (21525244244).

Almost surely, 2^221200120212 is an apocalyptic number.

It is an amenable number.

221200120212 is an abundant number, since it is smaller than the sum of its proper divisors (295405741644).

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

221200120212 is a wasteful number, since it uses less digits than its factorization.

221200120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16866007 (or 16866005 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221200120212 its reverse (212021002122), we get a palindrome (433221122334).

The spelling of 221200120212 in words is "two hundred twenty-one billion, two hundred million, one hundred twenty thousand, two hundred twelve".