1212100110 has 72 divisors (see below), whose sum is σ = 3412570824. Its totient is φ = 298359360.

The previous prime is 1212100067. The next prime is 1212100121. The reversal of 1212100110 is 110012121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1212100092 and 1212100101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 24636 + ... + 55055.

It is an arithmetic number, because the mean of its divisors is an integer number (47396817).

Almost surely, 2^1212100110 is an apocalyptic number.

1212100110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212100110 is an abundant number, since it is smaller than the sum of its proper divisors (2200470714).

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

1212100110 is a wasteful number, since it uses less digits than its factorization.

1212100110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79730 (or 79714 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1212100110 is about 34815.2281336774. The cubic root of 1212100110 is about 1066.2183768355.

Adding to 1212100110 its reverse (110012121), we get a palindrome (1322112231).

The spelling of 1212100110 in words is "one billion, two hundred twelve million, one hundred thousand, one hundred ten".