121586490521 has 2 divisors, whose sum is σ = 121586490522. Its totient is φ = 121586490520.

The previous prime is 121586490503. The next prime is 121586490569. The reversal of 121586490521 is 125094685121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118030038025 + 3556452496 = 343555^2 + 59636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121586490521 is a prime.

It is not a weakly prime, because it can be changed into another prime (121586490121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60793245260 + 60793245261.

It is an arithmetic number, because the mean of its divisors is an integer number (60793245261).

Almost surely, 2^121586490521 is an apocalyptic number.

It is an amenable number.

121586490521 is a deficient number, since it is larger than the sum of its proper divisors (1).

121586490521 is an equidigital number, since it uses as much as digits as its factorization.

121586490521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 44.

The spelling of 121586490521 in words is "one hundred twenty-one billion, five hundred eighty-six million, four hundred ninety thousand, five hundred twenty-one".