1211202021089 has 2 divisors, whose sum is σ = 1211202021090. Its totient is φ = 1211202021088.

The previous prime is 1211202021061. The next prime is 1211202021101. The reversal of 1211202021089 is 9801202021121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631441604689 + 579760416400 = 794633^2 + 761420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211202021089 - 2³⁶ = 1142482544353 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211201021089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605601010544 + 605601010545.

It is an arithmetic number, because the mean of its divisors is an integer number (605601010545).

Almost surely, 2^{1211202021089} is an apocalyptic number.

It is an amenable number.

1211202021089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211202021089 is an equidigital number, since it uses as much as digits as its factorization.

1211202021089 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 1211202021089 in words is "one trillion, two hundred eleven billion, two hundred two million, twenty-one thousand, eighty-nine".