221101221212 has 12 divisors (see below), whose sum is σ = 387201758160. Its totient is φ = 110472147456.

The previous prime is 221101221191. The next prime is 221101221227. The reversal of 221101221212 is 212122101122.

It is a super-3 number, since 3×221101221212³ (a number of 35 digits) contains 333 as substring.

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, 19609448 + ... + 19620719.

It is an arithmetic number, because the mean of its divisors is an integer number (32266813180).

Almost surely, 2^221101221212 is an apocalyptic number.

It is an amenable number.

221101221212 is a deficient number, since it is larger than the sum of its proper divisors (166100536948).

221101221212 is a wasteful number, since it uses less digits than its factorization.

221101221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39231580 (or 39231578 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221101221212 its reverse (212122101122), we get a palindrome (433223322334).

The spelling of 221101221212 in words is "two hundred twenty-one billion, one hundred one million, two hundred twenty-one thousand, two hundred twelve".