242421820 has 12 divisors (see below), whose sum is σ = 509085864. Its totient is φ = 96968720.

The previous prime is 242421811. The next prime is 242421833. The reversal of 242421820 is 28124242.

It is a super-2 number, since 2×242421820² = 117536677624224800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6060526 + ... + 6060565.

It is an arithmetic number, because the mean of its divisors is an integer number (42423822).

Almost surely, 2^242421820 is an apocalyptic number.

242421820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

242421820 is an abundant number, since it is smaller than the sum of its proper divisors (266664044).

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

242421820 is a wasteful number, since it uses less digits than its factorization.

242421820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12121100 (or 12121098 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 242421820 is about 15569.9010915291. The cubic root of 242421820 is about 623.5298308760.

It can be divided in two parts, 24242 and 1820, that added together give a palindrome (26062).

The spelling of 242421820 in words is "two hundred forty-two million, four hundred twenty-one thousand, eight hundred twenty".