242120203515 has 40 divisors (see below), whose sum is σ = 448989211440. Its totient is φ = 124677983808.

The previous prime is 242120203513. The next prime is 242120203519. The reversal of 242120203515 is 515302021242.

242120203515 is a `hidden beast` number, since 2 + 4 + 2 + 120 + 20 + 3 + 515 = 666.

It is not a de Polignac number, because 242120203515 - 2¹ = 242120203513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (242120203511) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10295629 + ... + 10319118.

It is an arithmetic number, because the mean of its divisors is an integer number (11224730286).

Almost surely, 2^242120203515 is an apocalyptic number.

242120203515 is a deficient number, since it is larger than the sum of its proper divisors (206869007925).

242120203515 is a wasteful number, since it uses less digits than its factorization.

242120203515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20614793 (or 20614784 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 242120203515 its reverse (515302021242), we get a palindrome (757422224757).

The spelling of 242120203515 in words is "two hundred forty-two billion, one hundred twenty million, two hundred three thousand, five hundred fifteen".