121056305 has 4 divisors (see below), whose sum is σ = 145267572. Its totient is φ = 96845040.

The previous prime is 121056301. The next prime is 121056307. The reversal of 121056305 is 503650121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81504784 + 39551521 = 9028^2 + 6289^2 .

It is not a de Polignac number, because 121056305 - 2² = 121056301 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121056301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12105626 + ... + 12105635.

It is an arithmetic number, because the mean of its divisors is an integer number (36316893).

Almost surely, 2^121056305 is an apocalyptic number.

It is an amenable number.

121056305 is a deficient number, since it is larger than the sum of its proper divisors (24211267).

121056305 is an equidigital number, since it uses as much as digits as its factorization.

121056305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24211266.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 121056305 is about 11002.5590205188. The cubic root of 121056305 is about 494.6854512858.

The spelling of 121056305 in words is "one hundred twenty-one million, fifty-six thousand, three hundred five".