121020905 has 8 divisors (see below), whose sum is σ = 145805184. Its totient is φ = 96430000.

The previous prime is 121020901. The next prime is 121020919. The reversal of 121020905 is 509020121.

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

It is not a de Polignac number, because 121020905 - 2² = 121020901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121020901) 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, 46961 + ... + 49470.

It is an arithmetic number, because the mean of its divisors is an integer number (18225648).

Almost surely, 2^121020905 is an apocalyptic number.

It is an amenable number.

121020905 is a deficient number, since it is larger than the sum of its proper divisors (24784279).

121020905 is an equidigital number, since it uses as much as digits as its factorization.

121020905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96687.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 121020905 is about 11000.9501862339. The cubic root of 121020905 is about 494.6372269706.

The spelling of 121020905 in words is "one hundred twenty-one million, twenty thousand, nine hundred five".