1212011121100 has 72 divisors (see below), whose sum is σ = 2955523646880. Its totient is φ = 428054753280.

The previous prime is 1212011121091. The next prime is 1212011121103. The reversal of 1212011121100 is 11211102121.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1212011121103) 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 23 ways as a sum of consecutive naturals, for example, 20237845 + ... + 20297644.

It is an arithmetic number, because the mean of its divisors is an integer number (41048939540).

Almost surely, 2^{1212011121100} is an apocalyptic number.

1212011121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212011121100 is an abundant number, since it is smaller than the sum of its proper divisors (1743512525780).

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

1212011121100 is a wasteful number, since it uses less digits than its factorization.

1212011121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40535539 (or 40535532 counting only the distinct ones).

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

Adding to 1212011121100 its reverse (11211102121), we get a palindrome (1223222223221).

The spelling of 1212011121100 in words is "one trillion, two hundred twelve billion, eleven million, one hundred twenty-one thousand, one hundred".