1221000011333 has 2 divisors, whose sum is σ = 1221000011334. Its totient is φ = 1221000011332.

The previous prime is 1221000011327. The next prime is 1221000011393. The reversal of 1221000011333 is 3331100001221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1122279628129 + 98720383204 = 1059377^2 + 314198^2 .

It is an emirp because it is prime and its reverse (3331100001221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221000011333 - 2¹⁰ = 1221000010309 is a prime.

It is a super-2 number, since 2×1221000011333² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221000011303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610500005666 + 610500005667.

It is an arithmetic number, because the mean of its divisors is an integer number (610500005667).

Almost surely, 2^{1221000011333} is an apocalyptic number.

It is an amenable number.

1221000011333 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221000011333 is an equidigital number, since it uses as much as digits as its factorization.

1221000011333 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 1221000011333 its reverse (3331100001221), we get a palindrome (4552100012554).

The spelling of 1221000011333 in words is "one trillion, two hundred twenty-one billion, eleven thousand, three hundred thirty-three".