221200121111212 has 12 divisors (see below), whose sum is σ = 387143897844816. Its totient is φ = 110587578869840.

The previous prime is 221200121111209. The next prime is 221200121111293. The reversal of 221200121111212 is 212111121002122.

It is a happy number.

It is a super-2 number, since 2×221200121111212² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221200121111212.

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, 3120381568 + ... + 3120452455.

It is an arithmetic number, because the mean of its divisors is an integer number (32261991487068).

Almost surely, 2^{221200121111212} is an apocalyptic number.

It is an amenable number.

221200121111212 is a deficient number, since it is larger than the sum of its proper divisors (165943776733604).

221200121111212 is a wasteful number, since it uses less digits than its factorization.

221200121111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6240842888 (or 6240842886 counting only the distinct ones).

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

Adding to 221200121111212 its reverse (212111121002122), we get a palindrome (433311242113334).

The spelling of 221200121111212 in words is "two hundred twenty-one trillion, two hundred billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twelve".