1212211212201 has 42 divisors (see below), whose sum is σ = 1997732028810. Its totient is φ = 734673408480.

The previous prime is 1212211212197. The next prime is 1212211212227. The reversal of 1212211212201 is 1022121122121.

1212211212201 is a `hidden beast` number, since 1 + 212 + 211 + 21 + 220 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 843318968976 + 368892243225 = 918324^2 + 607365^2 .

It is not a de Polignac number, because 1212211212201 - 2² = 1212211212197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212211212101) by changing a digit.

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 41 ways as a sum of consecutive naturals, for example, 6783036 + ... + 6959453.

It is an arithmetic number, because the mean of its divisors is an integer number (47565048305).

Almost surely, 2^{1212211212201} is an apocalyptic number.

1212211212201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212211212201 is a deficient number, since it is larger than the sum of its proper divisors (785520816609).

1212211212201 is an equidigital number, since it uses as much as digits as its factorization.

1212211212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13742529 (or 13742503 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1212211212201 its reverse (1022121122121), we get a palindrome (2234332334322).

The spelling of 1212211212201 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred twelve thousand, two hundred one".