1242144220 has 36 divisors (see below), whose sum is σ = 2652125112. Its totient is φ = 488683200.

The previous prime is 1242144193. The next prime is 1242144221. The reversal of 1242144220 is 224412421.

It is a junction number, because it is equal to n+sod(n) for n = 1242144191 and 1242144200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242144221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66075 + ... + 82765.

It is an arithmetic number, because the mean of its divisors is an integer number (73670142).

Almost surely, 2^1242144220 is an apocalyptic number.

1242144220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242144220 is an abundant number, since it is smaller than the sum of its proper divisors (1409980892).

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

1242144220 is a wasteful number, since it uses less digits than its factorization.

1242144220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16822 (or 16759 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 1242144220 is about 35244.0664509645. The cubic root of 1242144220 is about 1074.9559657463.

Adding to 1242144220 its reverse (224412421), we get a palindrome (1466556641).

The spelling of 1242144220 in words is "one billion, two hundred forty-two million, one hundred forty-four thousand, two hundred twenty".