121520505 has 32 divisors (see below), whose sum is σ = 206889984. Its totient is φ = 60696576.

The previous prime is 121520501. The next prime is 121520519. The reversal of 121520505 is 505025121.

It is not a de Polignac number, because 121520505 - 2² = 121520501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121520501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55797 + ... + 57933.

It is an arithmetic number, because the mean of its divisors is an integer number (6465312).

Almost surely, 2^121520505 is an apocalyptic number.

121520505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121520505 is a deficient number, since it is larger than the sum of its proper divisors (85369479).

121520505 is a wasteful number, since it uses less digits than its factorization.

121520505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2385.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 121520505 is about 11023.6339289728. The cubic root of 121520505 is about 495.3169483259.

Adding to 121520505 its reverse (505025121), we get a palindrome (626545626).

The spelling of 121520505 in words is "one hundred twenty-one million, five hundred twenty thousand, five hundred five".