121245243661 has 2 divisors, whose sum is σ = 121245243662. Its totient is φ = 121245243660.

The previous prime is 121245243599. The next prime is 121245243667. The reversal of 121245243661 is 166342542121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69804282025 + 51440961636 = 264205^2 + 226806^2 .

It is a cyclic number.

It is not a de Polignac number, because 121245243661 - 2²¹ = 121243146509 is a prime.

It is a super-2 number, since 2×121245243661² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121245243661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121245243667) 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, 60622621830 + 60622621831.

It is an arithmetic number, because the mean of its divisors is an integer number (60622621831).

Almost surely, 2^121245243661 is an apocalyptic number.

It is an amenable number.

121245243661 is a deficient number, since it is larger than the sum of its proper divisors (1).

121245243661 is an equidigital number, since it uses as much as digits as its factorization.

121245243661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 37.

Adding to 121245243661 its reverse (166342542121), we get a palindrome (287587785782).

The spelling of 121245243661 in words is "one hundred twenty-one billion, two hundred forty-five million, two hundred forty-three thousand, six hundred sixty-one".