121284905 has 8 divisors (see below), whose sum is σ = 166333632. Its totient is φ = 83166768.

The previous prime is 121284893. The next prime is 121284959. The reversal of 121284905 is 509482121.

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 121284905 - 2²² = 117090601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1732607 + ... + 1732676.

It is an arithmetic number, because the mean of its divisors is an integer number (20791704).

Almost surely, 2^121284905 is an apocalyptic number.

It is an amenable number.

121284905 is a deficient number, since it is larger than the sum of its proper divisors (45048727).

121284905 is an equidigital number, since it uses as much as digits as its factorization.

121284905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3465295.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 121284905 is about 11012.9426131257. The cubic root of 121284905 is about 494.9966397758.

The spelling of 121284905 in words is "one hundred twenty-one million, two hundred eighty-four thousand, nine hundred five".