221100212122212 has 48 divisors (see below), whose sum is σ = 519670646433792. Its totient is φ = 73161486862080.

The previous prime is 221100212122157. The next prime is 221100212122259. The reversal of 221100212122212 is 212221212001122.

221100212122212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216022338 + ... + 217043430.

It is an arithmetic number, because the mean of its divisors is an integer number (10826471800704).

Almost surely, 2^{221100212122212} is an apocalyptic number.

It is an amenable number.

221100212122212 is an abundant number, since it is smaller than the sum of its proper divisors (298570434311580).

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

221100212122212 is a wasteful number, since it uses less digits than its factorization.

221100212122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152948 (or 1152946 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221100212122212 its reverse (212221212001122), we get a palindrome (433321424123334).

The spelling of 221100212122212 in words is "two hundred twenty-one trillion, one hundred billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twelve".