242130021 has 24 divisors (see below), whose sum is σ = 376183584. Its totient is φ = 138126240.

The previous prime is 242130013. The next prime is 242130029. The reversal of 242130021 is 120031242.

It is an interprime number because it is at equal distance from previous prime (242130013) and next prime (242130029).

It is not a de Polignac number, because 242130021 - 2³ = 242130013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242130029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124426 + ... + 126356.

It is an arithmetic number, because the mean of its divisors is an integer number (15674316).

Almost surely, 2^242130021 is an apocalyptic number.

242130021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

242130021 is a deficient number, since it is larger than the sum of its proper divisors (134053563).

242130021 is a wasteful number, since it uses less digits than its factorization.

242130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801 (or 2794 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 242130021 is about 15560.5276581484. The cubic root of 242130021 is about 623.2795530318.

Adding to 242130021 its reverse (120031242), we get a palindrome (362161263).

The spelling of 242130021 in words is "two hundred forty-two million, one hundred thirty thousand, twenty-one".