221030021212 has 72 divisors (see below), whose sum is σ = 522196924032. Its totient is φ = 79491297600.

The previous prime is 221030021153. The next prime is 221030021237. The reversal of 221030021212 is 212120030122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2071114 + ... + 2175217.

It is an arithmetic number, because the mean of its divisors is an integer number (7252735056).

Almost surely, 2^221030021212 is an apocalyptic number.

221030021212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221030021212 is an abundant number, since it is smaller than the sum of its proper divisors (301166902820).

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

221030021212 is a wasteful number, since it uses less digits than its factorization.

221030021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4246379 (or 4246364 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 221030021212 its reverse (212120030122), we get a palindrome (433150051334).

The spelling of 221030021212 in words is "two hundred twenty-one billion, thirty million, twenty-one thousand, two hundred twelve".