1212211001100 has 72 divisors (see below), whose sum is σ = 3826178733888. Its totient is φ = 293869332800.

The previous prime is 1212211001077. The next prime is 1212211001149. The reversal of 1212211001100 is 11001122121.

It is a super-2 number, since 2×1212211001100² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 183665034 + ... + 183671633.

It is an arithmetic number, because the mean of its divisors is an integer number (53141371304).

Almost surely, 2^{1212211001100} is an apocalyptic number.

1212211001100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212211001100 is an abundant number, since it is smaller than the sum of its proper divisors (2613967732788).

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

1212211001100 is a wasteful number, since it uses less digits than its factorization.

1212211001100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367336695 (or 367336688 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1212211001100 its reverse (11001122121), we get a palindrome (1223212123221).

The spelling of 1212211001100 in words is "one trillion, two hundred twelve billion, two hundred eleven million, one thousand, one hundred".