121084137735661 has 2 divisors, whose sum is σ = 121084137735662. Its totient is φ = 121084137735660.

The previous prime is 121084137735577. The next prime is 121084137735679. The reversal of 121084137735661 is 166537731480121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119395941654025 + 1688196081636 = 10926845^2 + 1299306^2 .

It is a cyclic number.

It is not a de Polignac number, because 121084137735661 - 2¹⁵ = 121084137702893 is a prime.

It is a super-2 number, since 2×121084137735661² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121084137735061) 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, 60542068867830 + 60542068867831.

It is an arithmetic number, because the mean of its divisors is an integer number (60542068867831).

Almost surely, 2^{121084137735661} is an apocalyptic number.

It is an amenable number.

121084137735661 is a deficient number, since it is larger than the sum of its proper divisors (1).

121084137735661 is an equidigital number, since it uses as much as digits as its factorization.

121084137735661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 121084137735661 in words is "one hundred twenty-one trillion, eighty-four billion, one hundred thirty-seven million, seven hundred thirty-five thousand, six hundred sixty-one".