1212110220100 has 36 divisors (see below), whose sum is σ = 2832608348164. Its totient is φ = 447548388480.

The previous prime is 1212110220037. The next prime is 1212110220157. The reversal of 1212110220100 is 10220112121.

It can be written as a sum of positive squares in 6 ways, for example, as 530104576 + 1211580115524 = 23024^2 + 1100718^2 .

It is a super-2 number, since 2×1212110220100² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 466194939 + ... + 466197538.

Almost surely, 2^{1212110220100} is an apocalyptic number.

1212110220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212110220100 is an abundant number, since it is smaller than the sum of its proper divisors (1620498128064).

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

1212110220100 is a wasteful number, since it uses less digits than its factorization.

1212110220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932392504 (or 932392497 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1212110220100 its reverse (10220112121), we get a palindrome (1222330332221).

The spelling of 1212110220100 in words is "one trillion, two hundred twelve billion, one hundred ten million, two hundred twenty thousand, one hundred".