1211420204389 has 2 divisors, whose sum is σ = 1211420204390. Its totient is φ = 1211420204388.

The previous prime is 1211420204363. The next prime is 1211420204437. The reversal of 1211420204389 is 9834020241121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 944191173025 + 267229031364 = 971695^2 + 516942^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211420204389 is a prime.

It is a super-3 number, since 3×1211420204389³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211420204989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605710102194 + 605710102195.

It is an arithmetic number, because the mean of its divisors is an integer number (605710102195).

Almost surely, 2^{1211420204389} is an apocalyptic number.

It is an amenable number.

1211420204389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211420204389 is an equidigital number, since it uses as much as digits as its factorization.

1211420204389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 1211420204389 in words is "one trillion, two hundred eleven billion, four hundred twenty million, two hundred four thousand, three hundred eighty-nine".