221021102211212 has 24 divisors (see below), whose sum is σ = 405189275131200. Its totient is φ = 105349211525376.

The previous prime is 221021102211209. The next prime is 221021102211281. The reversal of 221021102211212 is 212112201120122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12059195453 + ... + 12059213780.

It is an arithmetic number, because the mean of its divisors is an integer number (16882886463800).

Almost surely, 2^{221021102211212} is an apocalyptic number.

It is an amenable number.

221021102211212 is a deficient number, since it is larger than the sum of its proper divisors (184168172919988).

221021102211212 is a wasteful number, since it uses less digits than its factorization.

221021102211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24118409345 (or 24118409343 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221021102211212 its reverse (212112201120122), we get a palindrome (433133303331334).

The spelling of 221021102211212 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred two million, two hundred eleven thousand, two hundred twelve".