1221220013099 has 2 divisors, whose sum is σ = 1221220013100. Its totient is φ = 1221220013098.

The previous prime is 1221220013093. The next prime is 1221220013147. The reversal of 1221220013099 is 9903100221221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221220013099 - 2¹² = 1221220009003 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221220013093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610006549 + 610610006550.

It is an arithmetic number, because the mean of its divisors is an integer number (610610006550).

Almost surely, 2^{1221220013099} is an apocalyptic number.

1221220013099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221220013099 is an equidigital number, since it uses as much as digits as its factorization.

1221220013099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 1221220013099 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, thirteen thousand, ninety-nine".