1201212121236 has 12 divisors (see below), whose sum is σ = 2802828282912. Its totient is φ = 400404040408.

The previous prime is 1201212121199. The next prime is 1201212121237. The reversal of 1201212121236 is 6321212121021.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201212121237) 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 3 ways as a sum of consecutive naturals, for example, 50050505040 + ... + 50050505063.

It is an arithmetic number, because the mean of its divisors is an integer number (233569023576).

Almost surely, 2^{1201212121236} is an apocalyptic number.

It is an amenable number.

1201212121236 is an abundant number, since it is smaller than the sum of its proper divisors (1601616161676).

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

1201212121236 is a wasteful number, since it uses less digits than its factorization.

1201212121236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100101010110 (or 100101010108 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 1201212121236 its reverse (6321212121021), we get a palindrome (7522424242257).

The spelling of 1201212121236 in words is "one trillion, two hundred one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred thirty-six".