121361204581 has 2 divisors, whose sum is σ = 121361204582. Its totient is φ = 121361204580.

The previous prime is 121361204537. The next prime is 121361204603. The reversal of 121361204581 is 185402163121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78495228900 + 42865975681 = 280170^2 + 207041^2 .

It is a cyclic number.

It is not a de Polignac number, because 121361204581 - 2¹¹ = 121361202533 is a prime.

It is a super-2 number, since 2×121361204581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121361201581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60680602290 + 60680602291.

It is an arithmetic number, because the mean of its divisors is an integer number (60680602291).

Almost surely, 2^121361204581 is an apocalyptic number.

It is an amenable number.

121361204581 is a deficient number, since it is larger than the sum of its proper divisors (1).

121361204581 is an equidigital number, since it uses as much as digits as its factorization.

121361204581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 121361204581 in words is "one hundred twenty-one billion, three hundred sixty-one million, two hundred four thousand, five hundred eighty-one".