121773521 has 4 divisors (see below), whose sum is σ = 122454000. Its totient is φ = 121093044.

The previous prime is 121773517. The next prime is 121773529. The reversal of 121773521 is 125377121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121773521 - 2² = 121773517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121773529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339971 + ... + 340328.

It is an arithmetic number, because the mean of its divisors is an integer number (30613500).

Almost surely, 2^121773521 is an apocalyptic number.

It is an amenable number.

121773521 is a deficient number, since it is larger than the sum of its proper divisors (680479).

121773521 is an equidigital number, since it uses as much as digits as its factorization.

121773521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680478.

The product of its digits is 2940, while the sum is 29.

The square root of 121773521 is about 11035.1040321331. The cubic root of 121773521 is about 495.6604739876.

The spelling of 121773521 in words is "one hundred twenty-one million, seven hundred seventy-three thousand, five hundred twenty-one".