121220880 has 320 divisors, whose sum is σ = 451899648. Its totient is φ = 26542080.

The previous prime is 121220873. The next prime is 121220903. The reversal of 121220880 is 88022121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 121220880.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1660524 + ... + 1660596.

Almost surely, 2^121220880 is an apocalyptic number.

121220880 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 121220880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225949824).

121220880 is an abundant number, since it is smaller than the sum of its proper divisors (330678768).

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

121220880 is a wasteful number, since it uses less digits than its factorization.

121220880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 121220880 is about 11010.0354222863. The cubic root of 121220880 is about 494.9095233064.

The spelling of 121220880 in words is "one hundred twenty-one million, two hundred twenty thousand, eight hundred eighty".