121343220 has 72 divisors (see below), whose sum is σ = 369847296. Its totient is φ = 32202432.

The previous prime is 121343191. The next prime is 121343227. The reversal of 121343220 is 22343121.

121343220 is a `hidden beast` number, since 1 + 213 + 432 + 20 = 666.

It is a super-4 number, since 4×121343220⁴ (a number of 33 digits) contains 4444 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 121343193 and 121343202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121343227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38629 + ... + 41651.

It is an arithmetic number, because the mean of its divisors is an integer number (5136768).

Almost surely, 2^121343220 is an apocalyptic number.

121343220 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 121343220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184923648).

121343220 is an abundant number, since it is smaller than the sum of its proper divisors (248504076).

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

121343220 is a wasteful number, since it uses less digits than its factorization.

121343220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261 (or 3256 counting only the distinct ones).

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

The square root of 121343220 is about 11015.5898616461. The cubic root of 121343220 is about 495.0759601825.

Adding to 121343220 its reverse (22343121), we get a palindrome (143686341).

Subtracting from 121343220 its reverse (22343121), we obtain a palindrome (99000099).

The spelling of 121343220 in words is "one hundred twenty-one million, three hundred forty-three thousand, two hundred twenty".