121773520 has 80 divisors (see below), whose sum is σ = 313372800. Its totient is φ = 43635200.

The previous prime is 121773517. The next prime is 121773529. The reversal of 121773520 is 25377121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121773529) 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, 61506 + ... + 63454.

It is an arithmetic number, because the mean of its divisors is an integer number (3917160).

Almost surely, 2^121773520 is an apocalyptic number.

121773520 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 121773520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156686400).

121773520 is an abundant number, since it is smaller than the sum of its proper divisors (191599280).

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

121773520 is a wasteful number, since it uses less digits than its factorization.

121773520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044 (or 2038 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 121773520 is about 11035.1039868231. The cubic root of 121773520 is about 495.6604726308.

The spelling of 121773520 in words is "one hundred twenty-one million, seven hundred seventy-three thousand, five hundred twenty".