121566355 has 8 divisors (see below), whose sum is σ = 145951200. Its totient is φ = 97205376.

The previous prime is 121566311. The next prime is 121566377. The reversal of 121566355 is 553665121.

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

It is a cyclic number.

It is not a de Polignac number, because 121566355 - 2¹³ = 121558163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121566355.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8386 + ... + 17704.

It is an arithmetic number, because the mean of its divisors is an integer number (18243900).

Almost surely, 2^121566355 is an apocalyptic number.

121566355 is a deficient number, since it is larger than the sum of its proper divisors (24384845).

121566355 is an equidigital number, since it uses as much as digits as its factorization.

121566355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11933.

The product of its digits is 27000, while the sum is 34.

The square root of 121566355 is about 11025.7133556065. The cubic root of 121566355 is about 495.3792352803.

The spelling of 121566355 in words is "one hundred twenty-one million, five hundred sixty-six thousand, three hundred fifty-five".