121228660 has 96 divisors (see below), whose sum is σ = 300303360. Its totient is φ = 40255488.

The previous prime is 121228643. The next prime is 121228703. The reversal of 121228660 is 66822121.

121228660 = T₂₂₅ + T₂₂₆ + ... + T₉₀₃.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1072764 + ... + 1072876.

It is an arithmetic number, because the mean of its divisors is an integer number (3128160).

Almost surely, 2^121228660 is an apocalyptic number.

121228660 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 121228660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150151680).

121228660 is an abundant number, since it is smaller than the sum of its proper divisors (179074700).

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

121228660 is a wasteful number, since it uses less digits than its factorization.

121228660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 121228660 is about 11010.3887306489. The cubic root of 121228660 is about 494.9201109041.

The spelling of 121228660 in words is "one hundred twenty-one million, two hundred twenty-eight thousand, six hundred sixty".