1221093511019 has 2 divisors, whose sum is σ = 1221093511020. Its totient is φ = 1221093511018.

The previous prime is 1221093510947. The next prime is 1221093511021. The reversal of 1221093511019 is 9101153901221.

It is a strong prime.

It is an emirp because it is prime and its reverse (9101153901221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221093511019 - 2²⁴ = 1221076733803 is a prime.

It is a super-2 number, since 2×1221093511019² (a number of 25 digits) contains 22 as substring.

Together with 1221093511021, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221093511019.

It is not a weakly prime, because it can be changed into another prime (1221093511049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610546755509 + 610546755510.

It is an arithmetic number, because the mean of its divisors is an integer number (610546755510).

Almost surely, 2^{1221093511019} is an apocalyptic number.

1221093511019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221093511019 is an equidigital number, since it uses as much as digits as its factorization.

1221093511019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 35.

The spelling of 1221093511019 in words is "one trillion, two hundred twenty-one billion, ninety-three million, five hundred eleven thousand, nineteen".