121333520 has 80 divisors (see below), whose sum is σ = 351727488. Its totient is φ = 37816320.

The previous prime is 121333507. The next prime is 121333523. The reversal of 121333520 is 25333121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121333492 and 121333501.

It is not an unprimeable number, because it can be changed into a prime (121333523) 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, 3689 + ... + 16008.

Almost surely, 2^121333520 is an apocalyptic number.

121333520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121333520 is an abundant number, since it is smaller than the sum of its proper divisors (230393968).

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

121333520 is a wasteful number, since it uses less digits than its factorization.

121333520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19728 (or 19722 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 121333520 is about 11015.1495677544. The cubic root of 121333520 is about 495.0627679477.

Adding to 121333520 its reverse (25333121), we get a palindrome (146666641).

The spelling of 121333520 in words is "one hundred twenty-one million, three hundred thirty-three thousand, five hundred twenty".