121329520 has 40 divisors (see below), whose sum is σ = 303793056. Its totient is φ = 44798208.

The previous prime is 121329499. The next prime is 121329521. The reversal of 121329520 is 25923121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121329521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57292 + ... + 59371.

Almost surely, 2^121329520 is an apocalyptic number.

121329520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121329520 is an abundant number, since it is smaller than the sum of its proper divisors (182463536).

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

121329520 is a wasteful number, since it uses less digits than its factorization.

121329520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116689 (or 116683 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 121329520 is about 11014.9679981378. The cubic root of 121329520 is about 495.0573276460.

The spelling of 121329520 in words is "one hundred twenty-one million, three hundred twenty-nine thousand, five hundred twenty".