12121020324 has 72 divisors (see below), whose sum is σ = 35074411008. Its totient is φ = 3457399680.

The previous prime is 12121020319. The next prime is 12121020343. The reversal of 12121020324 is 42302012121.

It is a happy number.

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 = 12121020297 and 12121020306.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 113344 + ... + 192584.

Almost surely, 2^12121020324 is an apocalyptic number.

12121020324 is a gapful number since it is divisible by the number (14) 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 12121020324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17537205504).

12121020324 is an abundant number, since it is smaller than the sum of its proper divisors (22953390684).

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

12121020324 is a wasteful number, since it uses less digits than its factorization.

12121020324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79865 (or 79860 counting only the distinct ones).

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

Adding to 12121020324 its reverse (42302012121), we get a palindrome (54423032445).

The spelling of 12121020324 in words is "twelve billion, one hundred twenty-one million, twenty thousand, three hundred twenty-four".