121771361521 has 16 divisors (see below), whose sum is σ = 123019472448. Its totient is φ = 120530995200.

The previous prime is 121771361497. The next prime is 121771361531. The reversal of 121771361521 is 125163177121.

It is a cyclic number.

It is not a de Polignac number, because 121771361521 - 2¹³ = 121771353329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121771361531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51357466 + ... + 51359836.

It is an arithmetic number, because the mean of its divisors is an integer number (7688717028).

Almost surely, 2^121771361521 is an apocalyptic number.

It is an amenable number.

121771361521 is a deficient number, since it is larger than the sum of its proper divisors (1248110927).

121771361521 is a wasteful number, since it uses less digits than its factorization.

121771361521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3792.

The product of its digits is 17640, while the sum is 37.

The spelling of 121771361521 in words is "one hundred twenty-one billion, seven hundred seventy-one million, three hundred sixty-one thousand, five hundred twenty-one".