221201111212 has 48 divisors (see below), whose sum is σ = 415506873600. Its totient is φ = 102734481600.

The previous prime is 221201111203. The next prime is 221201111221. The reversal of 221201111212 is 212111102122.

It is an interprime number because it is at equal distance from previous prime (221201111203) and next prime (221201111221).

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, 650739 + ... + 930517.

It is an arithmetic number, because the mean of its divisors is an integer number (8656393200).

Almost surely, 2^221201111212 is an apocalyptic number.

It is an amenable number.

221201111212 is a deficient number, since it is larger than the sum of its proper divisors (194305762388).

221201111212 is a wasteful number, since it uses less digits than its factorization.

221201111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280006 (or 280004 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221201111212 its reverse (212111102122), we get a palindrome (433312213334).

The spelling of 221201111212 in words is "two hundred twenty-one billion, two hundred one million, one hundred eleven thousand, two hundred twelve".