121505605 has 16 divisors (see below), whose sum is σ = 157860864. Its totient is φ = 89248320.

The previous prime is 121505581. The next prime is 121505617. The reversal of 121505605 is 506505121.

It is not a de Polignac number, because 121505605 - 2⁹ = 121505093 is a prime.

It is a super-2 number, since 2×121505605² = 29527224092832050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121505605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7522 + ... + 17308.

It is an arithmetic number, because the mean of its divisors is an integer number (9866304).

Almost surely, 2^121505605 is an apocalyptic number.

It is an amenable number.

121505605 is a deficient number, since it is larger than the sum of its proper divisors (36355259).

121505605 is a wasteful number, since it uses less digits than its factorization.

121505605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9996.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 121505605 is about 11022.9580875553. The cubic root of 121505605 is about 495.2967033908.

The spelling of 121505605 in words is "one hundred twenty-one million, five hundred five thousand, six hundred five".