1201221001212 has 24 divisors (see below), whose sum is σ = 2805279953616. Its totient is φ = 400059721728.

The previous prime is 1201221001207. The next prime is 1201221001213. The reversal of 1201221001212 is 2121001221021.

It is a junction number, because it is equal to n+sod(n) for n = 1201221001191 and 1201221001200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201221001213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43395423 + ... + 43423094.

It is an arithmetic number, because the mean of its divisors is an integer number (116886664734).

Almost surely, 2^{1201221001212} is an apocalyptic number.

1201221001212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1201221001212 is an abundant number, since it is smaller than the sum of its proper divisors (1604058952404).

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

1201221001212 is a wasteful number, since it uses less digits than its factorization.

1201221001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86819677 (or 86819675 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1201221001212 its reverse (2121001221021), we get a palindrome (3322222222233).

The spelling of 1201221001212 in words is "one trillion, two hundred one billion, two hundred twenty-one million, one thousand, two hundred twelve".