221021110212 has 24 divisors (see below), whose sum is σ = 589389627456. Its totient is φ = 63148888608.

The previous prime is 221021110207. The next prime is 221021110213. The reversal of 221021110212 is 212011120122.

It is a junction number, because it is equal to n+sod(n) for n = 221021110191 and 221021110200.

It is not an unprimeable number, because it can be changed into a prime (221021110213) 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 7 ways as a sum of consecutive naturals, for example, 1315601763 + ... + 1315601930.

It is an arithmetic number, because the mean of its divisors is an integer number (24557901144).

Almost surely, 2^221021110212 is an apocalyptic number.

It is an amenable number.

221021110212 is an abundant number, since it is smaller than the sum of its proper divisors (368368517244).

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

221021110212 is a wasteful number, since it uses less digits than its factorization.

221021110212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2631203707 (or 2631203705 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221021110212 its reverse (212011120122), we get a palindrome (433032230334).

The spelling of 221021110212 in words is "two hundred twenty-one billion, twenty-one million, one hundred ten thousand, two hundred twelve".