1221100010993 has 2 divisors, whose sum is σ = 1221100010994. Its totient is φ = 1221100010992.

The previous prime is 1221100010981. The next prime is 1221100011007. The reversal of 1221100010993 is 3990100011221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1196380939264 + 24719071729 = 1093792^2 + 157223^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221100010993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221100010393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550005496 + 610550005497.

It is an arithmetic number, because the mean of its divisors is an integer number (610550005497).

Almost surely, 2^{1221100010993} is an apocalyptic number.

It is an amenable number.

1221100010993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221100010993 is an equidigital number, since it uses as much as digits as its factorization.

1221100010993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 1221100010993 in words is "one trillion, two hundred twenty-one billion, one hundred million, ten thousand, nine hundred ninety-three".