1201212121189 has 2 divisors, whose sum is σ = 1201212121190. Its totient is φ = 1201212121188.

The previous prime is 1201212121181. The next prime is 1201212121199. The reversal of 1201212121189 is 9811212121021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1133762837089 + 67449284100 = 1064783^2 + 259710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201212121189 - 2³ = 1201212121181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201212121189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201212121181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600606060594 + 600606060595.

It is an arithmetic number, because the mean of its divisors is an integer number (600606060595).

Almost surely, 2^{1201212121189} is an apocalyptic number.

It is an amenable number.

1201212121189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201212121189 is an equidigital number, since it uses as much as digits as its factorization.

1201212121189 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 31.

The spelling of 1201212121189 in words is "one trillion, two hundred one billion, two hundred twelve million, one hundred twenty-one thousand, one hundred eighty-nine".