1211021333117 has 2 divisors, whose sum is σ = 1211021333118. Its totient is φ = 1211021333116.

The previous prime is 1211021333107. The next prime is 1211021333147. The reversal of 1211021333117 is 7113331201121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 769320197881 + 441701135236 = 877109^2 + 664606^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211021333117 - 2¹⁴ = 1211021316733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211021333107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605510666558 + 605510666559.

It is an arithmetic number, because the mean of its divisors is an integer number (605510666559).

Almost surely, 2^{1211021333117} is an apocalyptic number.

It is an amenable number.

1211021333117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211021333117 is an equidigital number, since it uses as much as digits as its factorization.

1211021333117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 26.

Adding to 1211021333117 its reverse (7113331201121), we get a palindrome (8324352534238).

The spelling of 1211021333117 in words is "one trillion, two hundred eleven billion, twenty-one million, three hundred thirty-three thousand, one hundred seventeen".