121554321 has 8 divisors (see below), whose sum is σ = 185225664. Its totient is φ = 69459600.

The previous prime is 121554313. The next prime is 121554347. The reversal of 121554321 is 123455121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121554321 - 2³ = 121554313 is a prime.

It is a zygodrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 121554291 and 121554300.

It is not an unprimeable number, because it can be changed into a prime (121554221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2894130 + ... + 2894171.

It is an arithmetic number, because the mean of its divisors is an integer number (23153208).

Almost surely, 2^121554321 is an apocalyptic number.

It is an amenable number.

121554321 is a deficient number, since it is larger than the sum of its proper divisors (63671343).

121554321 is an equidigital number, since it uses as much as digits as its factorization.

121554321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5788311.

The product of its digits is 1200, while the sum is 24.

The square root of 121554321 is about 11025.1676177734. The cubic root of 121554321 is about 495.3628886784.

The spelling of 121554321 in words is "one hundred twenty-one million, five hundred fifty-four thousand, three hundred twenty-one".