221220121112012 has 24 divisors (see below), whose sum is σ = 429252753638352. Its totient is φ = 98906164430400.

The previous prime is 221220121111991. The next prime is 221220121112033. The reversal of 221220121112012 is 210211121022122.

It is an interprime number because it is at equal distance from previous prime (221220121111991) and next prime (221220121112033).

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, 41210899163 + ... + 41210904530.

It is an arithmetic number, because the mean of its divisors is an integer number (17885531401598).

Almost surely, 2^{221220121112012} is an apocalyptic number.

221220121112012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221220121112012 is a deficient number, since it is larger than the sum of its proper divisors (208032632526340).

221220121112012 is a wasteful number, since it uses less digits than its factorization.

221220121112012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82421803769 (or 82421803767 counting only the distinct ones).

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

Adding to 221220121112012 its reverse (210211121022122), we get a palindrome (431431242134134).

The spelling of 221220121112012 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twelve thousand, twelve".