221110112121012 has 36 divisors (see below), whose sum is σ = 558919804244256. Its totient is φ = 73703030964240.

The previous prime is 221110112120959. The next prime is 221110112121023. The reversal of 221110112121012 is 210121211011122.

It is a happy number.

221110112121012 is a `hidden beast` number, since 221 + 1 + 101 + 121 + 210 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×221110112121012² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6176064 + ... + 21917207.

It is an arithmetic number, because the mean of its divisors is an integer number (15525550117896).

Almost surely, 2^{221110112121012} is an apocalyptic number.

It is an amenable number.

221110112121012 is an abundant number, since it is smaller than the sum of its proper divisors (337809692123244).

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

221110112121012 is a wasteful number, since it uses less digits than its factorization.

221110112121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28311908 (or 28311903 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221110112121012 its reverse (210121211011122), we get a palindrome (431231323132134).

The spelling of 221110112121012 in words is "two hundred twenty-one trillion, one hundred ten billion, one hundred twelve million, one hundred twenty-one thousand, twelve".