221230312212 has 96 divisors (see below), whose sum is σ = 638339774464. Its totient is φ = 58069872000.

The previous prime is 221230312201. The next prime is 221230312213. The reversal of 221230312212 is 212213032122.

It is a super-3 number, since 3×221230312212³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221230312213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 249664 + ... + 710487.

Almost surely, 2^221230312212 is an apocalyptic number.

It is an amenable number.

221230312212 is an abundant number, since it is smaller than the sum of its proper divisors (417109462252).

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

221230312212 is a wasteful number, since it uses less digits than its factorization.

221230312212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960389 (or 960387 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221230312212 its reverse (212213032122), we get a palindrome (433443344334).

The spelling of 221230312212 in words is "two hundred twenty-one billion, two hundred thirty million, three hundred twelve thousand, two hundred twelve".