221111212012 has 12 divisors (see below), whose sum is σ = 387806416200. Its totient is φ = 110309378816.

The previous prime is 221111211953. The next prime is 221111212043. The reversal of 221111212012 is 210212111122.

It is a super-2 number, since 2×221111212012² (a number of 23 digits) contains 22 as substring.

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, 61554778 + ... + 61558369.

It is an arithmetic number, because the mean of its divisors is an integer number (32317201350).

Almost surely, 2^221111212012 is an apocalyptic number.

It is an amenable number.

221111212012 is a deficient number, since it is larger than the sum of its proper divisors (166695204188).

221111212012 is a wasteful number, since it uses less digits than its factorization.

221111212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123113600 (or 123113598 counting only the distinct ones).

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

Adding to 221111212012 its reverse (210212111122), we get a palindrome (431323323134).

The spelling of 221111212012 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, twelve".