242121315 has 16 divisors (see below), whose sum is σ = 399891456. Its totient is φ = 124965600.

The previous prime is 242121311. The next prime is 242121323. The reversal of 242121315 is 513121242.

It is not a de Polignac number, because 242121315 - 2² = 242121311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 242121291 and 242121300.

It is not an unprimeable number, because it can be changed into a prime (242121311) 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 15 ways as a sum of consecutive naturals, for example, 259881 + ... + 260810.

It is an arithmetic number, because the mean of its divisors is an integer number (24993216).

Almost surely, 2^242121315 is an apocalyptic number.

242121315 is a deficient number, since it is larger than the sum of its proper divisors (157770141).

242121315 is a wasteful number, since it uses less digits than its factorization.

242121315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520730.

The product of its digits is 480, while the sum is 21.

The square root of 242121315 is about 15560.2479093361. The cubic root of 242121315 is about 623.2720827522.

Adding to 242121315 its reverse (513121242), we get a palindrome (755242557).

The spelling of 242121315 in words is "two hundred forty-two million, one hundred twenty-one thousand, three hundred fifteen".