242403021 has 24 divisors (see below), whose sum is σ = 410976384. Its totient is φ = 134771040.

The previous prime is 242403019. The next prime is 242403023. The reversal of 242403021 is 120304242.

242403021 is a `hidden beast` number, since 242 + 403 + 0 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (242403019) and next prime (242403023).

It is not a de Polignac number, because 242403021 - 2¹ = 242403019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 242402985 and 242403003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242403023) 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, 49665 + ... + 54326.

It is an arithmetic number, because the mean of its divisors is an integer number (17124016).

Almost surely, 2^242403021 is an apocalyptic number.

242403021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

242403021 is a deficient number, since it is larger than the sum of its proper divisors (168573363).

242403021 is a wasteful number, since it uses less digits than its factorization.

242403021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104041 (or 104038 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 242403021 is about 15569.2973829907. The cubic root of 242403021 is about 623.5137129095.

Adding to 242403021 its reverse (120304242), we get a palindrome (362707263).

It can be divided in two parts, 24240 and 3021, that added together give a triangular number (27261 = T₂₃₃).

The spelling of 242403021 in words is "two hundred forty-two million, four hundred three thousand, twenty-one".