1221201012089 has 2 divisors, whose sum is σ = 1221201012090. Its totient is φ = 1221201012088.

The previous prime is 1221201012077. The next prime is 1221201012113. The reversal of 1221201012089 is 9802101021221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 939218771689 + 281982240400 = 969133^2 + 531020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221201012089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221201017089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600506044 + 610600506045.

It is an arithmetic number, because the mean of its divisors is an integer number (610600506045).

Almost surely, 2^{1221201012089} is an apocalyptic number.

It is an amenable number.

1221201012089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221201012089 is an equidigital number, since it uses as much as digits as its factorization.

1221201012089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 1221201012089 in words is "one trillion, two hundred twenty-one billion, two hundred one million, twelve thousand, eighty-nine".