1212221221110 has 48 divisors (see below), whose sum is σ = 3152606133456. Its totient is φ = 323173765824.

The previous prime is 1212221221103. The next prime is 1212221221139. The reversal of 1212221221110 is 111221222121.

1212221221110 is a `hidden beast` number, since 1 + 212 + 221 + 221 + 1 + 10 = 666.

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 23 ways as a sum of consecutive naturals, for example, 1431924 + ... + 2115383.

It is an arithmetic number, because the mean of its divisors is an integer number (65679294447).

Almost surely, 2^{1212221221110} is an apocalyptic number.

1212221221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212221221110 is an abundant number, since it is smaller than the sum of its proper divisors (1940384912346).

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

1212221221110 is a wasteful number, since it uses less digits than its factorization.

1212221221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3551117 (or 3551114 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1212221221110 its reverse (111221222121), we get a palindrome (1323442443231).

The spelling of 1212221221110 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred ten".