242021540 has 24 divisors (see below), whose sum is σ = 516862080. Its totient is φ = 95167328.

The previous prime is 242021519. The next prime is 242021561. The reversal of 242021540 is 45120242.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (242021519) and next prime (242021561).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101372 + ... + 103731.

It is an arithmetic number, because the mean of its divisors is an integer number (21535920).

Almost surely, 2^242021540 is an apocalyptic number.

242021540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

242021540 is an abundant number, since it is smaller than the sum of its proper divisors (274840540).

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

242021540 is a wasteful number, since it uses less digits than its factorization.

242021540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205171 (or 205169 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 242021540 is about 15557.0414925204. The cubic root of 242021540 is about 623.1864569216.

Adding to 242021540 its reverse (45120242), we get a palindrome (287141782).

The spelling of 242021540 in words is "two hundred forty-two million, twenty-one thousand, five hundred forty".