121047505 has 16 divisors (see below), whose sum is σ = 153659520. Its totient is φ = 91352448.

The previous prime is 121047503. The next prime is 121047517. The reversal of 121047505 is 505740121.

It is a cyclic number.

It is not a de Polignac number, because 121047505 - 2¹ = 121047503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121047505.

It is not an unprimeable number, because it can be changed into a prime (121047503) 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, 1186 + ... + 15604.

It is an arithmetic number, because the mean of its divisors is an integer number (9603720).

Almost surely, 2^121047505 is an apocalyptic number.

It is an amenable number.

121047505 is a deficient number, since it is larger than the sum of its proper divisors (32612015).

121047505 is a wasteful number, since it uses less digits than its factorization.

121047505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14520.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 121047505 is about 11002.1591062845. The cubic root of 121047505 is about 494.6734641986.

Adding to 121047505 its reverse (505740121), we get a palindrome (626787626).

The spelling of 121047505 in words is "one hundred twenty-one million, forty-seven thousand, five hundred five".