1221330010011 has 4 divisors (see below), whose sum is σ = 1628440013352. Its totient is φ = 814220006672.

The previous prime is 1221330009959. The next prime is 1221330010049. The reversal of 1221330010011 is 1100100331221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1221330010011 - 2⁹ = 1221330009499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221330010051) 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, 203555001666 + ... + 203555001671.

It is an arithmetic number, because the mean of its divisors is an integer number (407110003338).

Almost surely, 2^{1221330010011} is an apocalyptic number.

1221330010011 is a deficient number, since it is larger than the sum of its proper divisors (407110003341).

1221330010011 is an equidigital number, since it uses as much as digits as its factorization.

1221330010011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407110003340.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 1221330010011 its reverse (1100100331221), we get a palindrome (2321430341232).

The spelling of 1221330010011 in words is "one trillion, two hundred twenty-one billion, three hundred thirty million, ten thousand, eleven".