242140021 has 8 divisors (see below), whose sum is σ = 252854784. Its totient is φ = 231440880.

The previous prime is 242139991. The next prime is 242140057. The reversal of 242140021 is 120041242.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 242140021 - 2⁷ = 242139893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242139977 and 242140004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242140091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37020 + ... + 43066.

It is an arithmetic number, because the mean of its divisors is an integer number (31606848).

Almost surely, 2^242140021 is an apocalyptic number.

It is an amenable number.

242140021 is a deficient number, since it is larger than the sum of its proper divisors (10714763).

242140021 is a wasteful number, since it uses less digits than its factorization.

242140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7811.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 242140021 is about 15560.8489806951. The cubic root of 242140021 is about 623.2881334213.

Adding to 242140021 its reverse (120041242), we get a palindrome (362181263).

The spelling of 242140021 in words is "two hundred forty-two million, one hundred forty thousand, twenty-one".