221202221212 has 24 divisors (see below), whose sum is σ = 442439353440. Its totient is φ = 94793471040.

The previous prime is 221202221209. The next prime is 221202221267. The reversal of 221202221212 is 212122202122.

It is a self number, because there is not a number n which added to its sum of digits gives 221202221212.

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, 57114 + ... + 667582.

It is an arithmetic number, because the mean of its divisors is an integer number (18434973060).

Almost surely, 2^221202221212 is an apocalyptic number.

It is an amenable number.

221202221212 is an abundant number, since it is smaller than the sum of its proper divisors (221237132228).

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

221202221212 is a wasteful number, since it uses less digits than its factorization.

221202221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623421 (or 623419 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221202221212 its reverse (212122202122), we get a palindrome (433324423334).

The spelling of 221202221212 in words is "two hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, two hundred twelve".