121537580321 has 2 divisors, whose sum is σ = 121537580322. Its totient is φ = 121537580320.

The previous prime is 121537580309. The next prime is 121537580369. The reversal of 121537580321 is 123085735121.

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., 62227797025 + 59309783296 = 249455^2 + 243536^2 .

It is a cyclic number.

It is not a de Polignac number, because 121537580321 - 2³⁰ = 120463838497 is a prime.

It is not a weakly prime, because it can be changed into another prime (121537586321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60768790160 + 60768790161.

It is an arithmetic number, because the mean of its divisors is an integer number (60768790161).

Almost surely, 2^121537580321 is an apocalyptic number.

It is an amenable number.

121537580321 is a deficient number, since it is larger than the sum of its proper divisors (1).

121537580321 is an equidigital number, since it uses as much as digits as its factorization.

121537580321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 121537580321 in words is "one hundred twenty-one billion, five hundred thirty-seven million, five hundred eighty thousand, three hundred twenty-one".