121233420 has 144 divisors (see below), whose sum is σ = 458535168. Its totient is φ = 25188480.

The previous prime is 121233401. The next prime is 121233421. The reversal of 121233420 is 24332121.

121233420 is a `hidden beast` number, since 1 + 212 + 33 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 121233393 and 121233402.

It is not an unprimeable number, because it can be changed into a prime (121233421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9487 + ... + 18233.

It is an arithmetic number, because the mean of its divisors is an integer number (3184272).

Almost surely, 2^121233420 is an apocalyptic number.

121233420 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 121233420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229267584).

121233420 is an abundant number, since it is smaller than the sum of its proper divisors (337301748).

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

121233420 is a wasteful number, since it uses less digits than its factorization.

121233420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8780 (or 8775 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 121233420 is about 11010.6048880159. The cubic root of 121233420 is about 494.9265884397.

Adding to 121233420 its reverse (24332121), we get a palindrome (145565541).

The spelling of 121233420 in words is "one hundred twenty-one million, two hundred thirty-three thousand, four hundred twenty".