121555224 has 96 divisors (see below), whose sum is σ = 377788320. Its totient is φ = 34587648.

The previous prime is 121555183. The next prime is 121555229. The reversal of 121555224 is 422555121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121555229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217954 + ... + 218510.

It is an arithmetic number, because the mean of its divisors is an integer number (3935295).

Almost surely, 2^121555224 is an apocalyptic number.

121555224 is a gapful number since it is divisible by the number (14) 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 121555224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188894160).

121555224 is an abundant number, since it is smaller than the sum of its proper divisors (256233096).

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

121555224 is a wasteful number, since it uses less digits than its factorization.

121555224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 1002 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 121555224 is about 11025.2085694557. The cubic root of 121555224 is about 495.3641153222.

The spelling of 121555224 in words is "one hundred twenty-one million, five hundred fifty-five thousand, two hundred twenty-four".