1212211110100 has 18 divisors (see below), whose sum is σ = 2630498109134. Its totient is φ = 484884444000.

The previous prime is 1212211110091. The next prime is 1212211110101. The reversal of 1212211110100 is 10111122121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 983198736 + 1211227911364 = 31356^2 + 1100558^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212211110101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6061055451 + ... + 6061055650.

Almost surely, 2^{1212211110100} is an apocalyptic number.

1212211110100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212211110100 is an abundant number, since it is smaller than the sum of its proper divisors (1418286999034).

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

1212211110100 is a wasteful number, since it uses less digits than its factorization.

1212211110100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12122111115 (or 12122111108 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1212211110100 its reverse (10111122121), we get a palindrome (1222322232221).

It can be divided in two parts, 121221 and 1110100, that added together give a palindrome (1231321).

The spelling of 1212211110100 in words is "one trillion, two hundred twelve billion, two hundred eleven million, one hundred ten thousand, one hundred".