121213224 has 96 divisors (see below), whose sum is σ = 369757440. Its totient is φ = 35539200.

The previous prime is 121213219. The next prime is 121213229. The reversal of 121213224 is 422312121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121213219) and next prime (121213229).

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 121213197 and 121213206.

It is not an unprimeable number, because it can be changed into a prime (121213229) 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, 22084 + ... + 27020.

It is an arithmetic number, because the mean of its divisors is an integer number (3851640).

Almost surely, 2^121213224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121213224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184878720).

121213224 is an abundant number, since it is smaller than the sum of its proper divisors (248544216).

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

121213224 is a wasteful number, since it uses less digits than its factorization.

121213224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4991 (or 4984 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 121213224 is about 11009.6877339914. The cubic root of 121213224 is about 494.8991040149.

Adding to 121213224 its reverse (422312121), we get a palindrome (543525345).

The spelling of 121213224 in words is "one hundred twenty-one million, two hundred thirteen thousand, two hundred twenty-four".