121555330 has 32 divisors (see below), whose sum is σ = 236296368. Its totient is φ = 44755200.

The previous prime is 121555319. The next prime is 121555333. The reversal of 121555330 is 33555121.

It can be written as a sum of positive squares in 8 ways, for example, as 7557001 + 113998329 = 2749^2 + 10677^2 .

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 121555295 and 121555304.

It is not an unprimeable number, because it can be changed into a prime (121555333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53620 + ... + 55840.

Almost surely, 2^121555330 is an apocalyptic number.

121555330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121555330 is a deficient number, since it is larger than the sum of its proper divisors (114741038).

121555330 is a wasteful number, since it uses less digits than its factorization.

121555330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 121555330 is about 11025.2133766200. The cubic root of 121555330 is about 495.3642593132.

The spelling of 121555330 in words is "one hundred twenty-one million, five hundred fifty-five thousand, three hundred thirty".