221212222012 has 12 divisors (see below), whose sum is σ = 387136766520. Its totient is φ = 110601717296.

The previous prime is 221212221991. The next prime is 221212222039. The reversal of 221212222012 is 210222212122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983818 + ... + 1187569.

It is an arithmetic number, because the mean of its divisors is an integer number (32261397210).

Almost surely, 2^221212222012 is an apocalyptic number.

It is an amenable number.

221212222012 is a deficient number, since it is larger than the sum of its proper divisors (165924544508).

221212222012 is a wasteful number, since it uses less digits than its factorization.

221212222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196860 (or 2196858 counting only the distinct ones).

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

Adding to 221212222012 its reverse (210222212122), we get a palindrome (431434434134).

The spelling of 221212222012 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, twelve".