121520 has 60 divisors (see below), whose sum is σ = 339264. Its totient is φ = 40320.

The previous prime is 121507. The next prime is 121523. The reversal of 121520 is 25121.

121520 = T₂₉ + T₃₀ + ... + T₉₀.

121520 is nontrivially palindromic in base 6.

It is a super-2 number, since 2×121520² = 29534220800, which contains 22 as substring.

It is a nialpdrome in base 11.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121520.

It is not an unprimeable number, because it can be changed into a prime (121523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3905 + ... + 3935.

2¹²¹⁵²⁰ is an apocalyptic number.

121520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169632).

121520 is an abundant number, since it is smaller than the sum of its proper divisors (217744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121520 is a wasteful number, since it uses less digits than its factorization.

121520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58 (or 45 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 121520 is about 348.5971887437. The cubic root of 121520 is about 49.5316262199.

Adding to 121520 its reverse (25121), we get a palindrome (146641).

The spelling of 121520 in words is "one hundred twenty-one thousand, five hundred twenty".