121931424 has 144 divisors (see below), whose sum is σ = 360884160. Its totient is φ = 39029760.

The previous prime is 121931419. The next prime is 121931437. The reversal of 121931424 is 424139121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1369972 + ... + 1370060.

It is an arithmetic number, because the mean of its divisors is an integer number (2506140).

Almost surely, 2^121931424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121931424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180442080).

121931424 is an abundant number, since it is smaller than the sum of its proper divisors (238952736).

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

121931424 is a wasteful number, since it uses less digits than its factorization.

121931424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 232 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 121931424 is about 11042.2562911753. The cubic root of 121931424 is about 495.8746214487.

The spelling of 121931424 in words is "one hundred twenty-one million, nine hundred thirty-one thousand, four hundred twenty-four".