1221100193 has 2 divisors, whose sum is σ = 1221100194. Its totient is φ = 1221100192.

The previous prime is 1221100169. The next prime is 1221100207. The reversal of 1221100193 is 3910011221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 797893009 + 423207184 = 28247^2 + 20572^2 .

It is an emirp because it is prime and its reverse (3910011221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221100193 - 2¹⁰ = 1221099169 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221102193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550096 + 610550097.

It is an arithmetic number, because the mean of its divisors is an integer number (610550097).

Almost surely, 2^1221100193 is an apocalyptic number.

It is an amenable number.

1221100193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221100193 is an equidigital number, since it uses as much as digits as its factorization.

1221100193 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 20.

The square root of 1221100193 is about 34944.2440610754. The cubic root of 1221100193 is about 1068.8508328061.

The spelling of 1221100193 in words is "one billion, two hundred twenty-one million, one hundred thousand, one hundred ninety-three".