242300021 has 4 divisors (see below), whose sum is σ = 242451852. Its totient is φ = 242148192.

The previous prime is 242299979. The next prime is 242300039. The reversal of 242300021 is 120003242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120003242 = 2 ⋅60001621.

It can be written as a sum of positive squares in 2 ways, for example, as 59752900 + 182547121 = 7730^2 + 13511^2 .

It is a cyclic number.

It is not a de Polignac number, because 242300021 - 2²² = 238105717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242299969 and 242300005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242300081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73496 + ... + 76721.

It is an arithmetic number, because the mean of its divisors is an integer number (60612963).

Almost surely, 2^242300021 is an apocalyptic number.

It is an amenable number.

242300021 is a deficient number, since it is larger than the sum of its proper divisors (151831).

242300021 is a wasteful number, since it uses less digits than its factorization.

242300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151830.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 242300021 is about 15565.9892393641. The cubic root of 242300021 is about 623.4253875378.

Adding to 242300021 its reverse (120003242), we get a palindrome (362303263).

The spelling of 242300021 in words is "two hundred forty-two million, three hundred thousand, twenty-one".