1201212222100 has 144 divisors (see below), whose sum is σ = 2994456467520. Its totient is φ = 413649331200.

The previous prime is 1201212222083. The next prime is 1201212222121. The reversal of 1201212222100 is 12222121021.

It is a happy number.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 59701242 + ... + 59721358.

It is an arithmetic number, because the mean of its divisors is an integer number (20794836580).

Almost surely, 2^{1201212222100} is an apocalyptic number.

1201212222100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201212222100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1497228233760).

1201212222100 is an abundant number, since it is smaller than the sum of its proper divisors (1793244245420).

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

1201212222100 is a wasteful number, since it uses less digits than its factorization.

1201212222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23018 (or 23011 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1201212222100 its reverse (12222121021), we get a palindrome (1213434343121).

The spelling of 1201212222100 in words is "one trillion, two hundred one billion, two hundred twelve million, two hundred twenty-two thousand, one hundred".