1221201110999 has 2 divisors, whose sum is σ = 1221201111000. Its totient is φ = 1221201110998.

The previous prime is 1221201110993. The next prime is 1221201111029. The reversal of 1221201110999 is 9990111021221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221201110999 - 2³⁶ = 1152481634263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221201110993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600555499 + 610600555500.

It is an arithmetic number, because the mean of its divisors is an integer number (610600555500).

Almost surely, 2^{1221201110999} is an apocalyptic number.

1221201110999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221201110999 is an equidigital number, since it uses as much as digits as its factorization.

1221201110999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 1221201110999 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred ten thousand, nine hundred ninety-nine".