121489620 has 216 divisors, whose sum is σ = 418394592. Its totient is φ = 26248320.

The previous prime is 121489607. The next prime is 121489631. The reversal of 121489620 is 26984121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2825319 + ... + 2825361.

It is an arithmetic number, because the mean of its divisors is an integer number (1937012).

Almost surely, 2^121489620 is an apocalyptic number.

121489620 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 121489620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209197296).

121489620 is an abundant number, since it is smaller than the sum of its proper divisors (296904972).

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

121489620 is a wasteful number, since it uses less digits than its factorization.

121489620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 121489620 is about 11022.2329861059. The cubic root of 121489620 is about 495.2749824038.

The spelling of 121489620 in words is "one hundred twenty-one million, four hundred eighty-nine thousand, six hundred twenty".