1212211221101 has 2 divisors, whose sum is σ = 1212211221102. Its totient is φ = 1212211221100.

The previous prime is 1212211221097. The next prime is 1212211221107. The reversal of 1212211221101 is 1011221122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 890465886025 + 321745335076 = 943645^2 + 567226^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212211221101 - 2² = 1212211221097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212211221101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212211221107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105610550 + 606105610551.

It is an arithmetic number, because the mean of its divisors is an integer number (606105610551).

Almost surely, 2^{1212211221101} is an apocalyptic number.

It is an amenable number.

1212211221101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212211221101 is an equidigital number, since it uses as much as digits as its factorization.

1212211221101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1212211221101 its reverse (1011221122121), we get a palindrome (2223432343222).

The spelling of 1212211221101 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty-one thousand, one hundred one".