1212210222101 has 4 divisors (see below), whose sum is σ = 1283516705772. Its totient is φ = 1140903738432.

The previous prime is 1212210222079. The next prime is 1212210222131. The reversal of 1212210222101 is 1012220122121.

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 684509677201 + 527700544900 = 827351^2 + 726430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212210222101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 71306483653 = 1212210222101 / (1 + 2 + 1 + 2 + 2 + 1 + 0 + 2 + 2 + 2 + 1 + 0 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212210222101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212210222131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35653241810 + ... + 35653241843.

It is an arithmetic number, because the mean of its divisors is an integer number (320879176443).

Almost surely, 2^{1212210222101} is an apocalyptic number.

It is an amenable number.

1212210222101 is a deficient number, since it is larger than the sum of its proper divisors (71306483671).

1212210222101 is an equidigital number, since it uses as much as digits as its factorization.

1212210222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71306483670.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1212210222101 its reverse (1012220122121), we get a palindrome (2224430344222).

The spelling of 1212210222101 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred twenty-two thousand, one hundred one".