1212211202101 has 4 divisors (see below), whose sum is σ = 1223332405900. Its totient is φ = 1201089998304.

The previous prime is 1212211202093. The next prime is 1212211202113. The reversal of 1212211202101 is 1012021122121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 492172402500 + 720038799601 = 701550^2 + 848551^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212211202101 - 2³ = 1212211202093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212211202141) 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, 5560601736 + ... + 5560601953.

It is an arithmetic number, because the mean of its divisors is an integer number (305833101475).

Almost surely, 2^{1212211202101} is an apocalyptic number.

It is an amenable number.

1212211202101 is a deficient number, since it is larger than the sum of its proper divisors (11121203799).

1212211202101 is a wasteful number, since it uses less digits than its factorization.

1212211202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11121203798.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1212211202101 its reverse (1012021122121), we get a palindrome (2224232324222).

The spelling of 1212211202101 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred two thousand, one hundred one".