1221031010219 has 2 divisors, whose sum is σ = 1221031010220. Its totient is φ = 1221031010218.

The previous prime is 1221031010201. The next prime is 1221031010233. The reversal of 1221031010219 is 9120101301221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221031010219 - 2²⁰ = 1221029961643 is a prime.

It is a super-2 number, since 2×1221031010219² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221031010194 and 1221031010203.

It is not a weakly prime, because it can be changed into another prime (1221031010249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610515505109 + 610515505110.

It is an arithmetic number, because the mean of its divisors is an integer number (610515505110).

Almost surely, 2^{1221031010219} is an apocalyptic number.

1221031010219 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221031010219 is an equidigital number, since it uses as much as digits as its factorization.

1221031010219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 1221031010219 in words is "one trillion, two hundred twenty-one billion, thirty-one million, ten thousand, two hundred nineteen".