221121112100212 has 24 divisors (see below), whose sum is σ = 387499562747136. Its totient is φ = 110407016542368.

The previous prime is 221121112100171. The next prime is 221121112100219. The reversal of 221121112100212 is 212001211121122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221121112100212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121112100219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5412978 + ... + 21715030.

It is an arithmetic number, because the mean of its divisors is an integer number (16145815114464).

Almost surely, 2^{221121112100212} is an apocalyptic number.

It is an amenable number.

221121112100212 is a deficient number, since it is larger than the sum of its proper divisors (166378450646924).

221121112100212 is a wasteful number, since it uses less digits than its factorization.

221121112100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16306767 (or 16306765 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221121112100212 its reverse (212001211121122), we get a palindrome (433122323221334).

The spelling of 221121112100212 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred twelve million, one hundred thousand, two hundred twelve".