121155320 has 128 divisors (see below), whose sum is σ = 326592000. Its totient is φ = 39866880.

The previous prime is 121155317. The next prime is 121155361. The reversal of 121155320 is 23551121.

It is a happy number.

It is a super-2 number, since 2×121155320² = 29357223128604800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121155292 and 121155301.

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, 337301 + ... + 337659.

It is an arithmetic number, because the mean of its divisors is an integer number (2551500).

Almost surely, 2^121155320 is an apocalyptic number.

121155320 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 121155320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163296000).

121155320 is an abundant number, since it is smaller than the sum of its proper divisors (205436680).

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

121155320 is a wasteful number, since it uses less digits than its factorization.

121155320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 121155320 is about 11007.0577358348. The cubic root of 121155320 is about 494.8202864263.

The spelling of 121155320 in words is "one hundred twenty-one million, one hundred fifty-five thousand, three hundred twenty".