121609020 has 144 divisors (see below), whose sum is σ = 376306560. Its totient is φ = 29323008.

The previous prime is 121608989. The next prime is 121609043. The reversal of 121609020 is 20906121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 679291 + ... + 679469.

It is an arithmetic number, because the mean of its divisors is an integer number (2613240).

Almost surely, 2^121609020 is an apocalyptic number.

121609020 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 121609020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188153280).

121609020 is an abundant number, since it is smaller than the sum of its proper divisors (254697540).

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

121609020 is a wasteful number, since it uses less digits than its factorization.

121609020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 121609020 is about 11027.6479813240. The cubic root of 121609020 is about 495.4371813652.

The spelling of 121609020 in words is "one hundred twenty-one million, six hundred nine thousand, twenty".