121320605 has 32 divisors (see below), whose sum is σ = 176098560. Its totient is φ = 78382080.

The previous prime is 121320593. The next prime is 121320623. The reversal of 121320605 is 506023121.

It is not a de Polignac number, because 121320605 - 2⁸ = 121320349 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159887 + ... + 160643.

It is an arithmetic number, because the mean of its divisors is an integer number (5503080).

Almost surely, 2^121320605 is an apocalyptic number.

It is an amenable number.

121320605 is a deficient number, since it is larger than the sum of its proper divisors (54777955).

121320605 is a wasteful number, since it uses less digits than its factorization.

121320605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 121320605 is about 11014.5633140856. The cubic root of 121320605 is about 495.0452021436.

Adding to 121320605 its reverse (506023121), we get a palindrome (627343726).

The spelling of 121320605 in words is "one hundred twenty-one million, three hundred twenty thousand, six hundred five".