242312021 has 4 divisors (see below), whose sum is σ = 276928032. Its totient is φ = 207696012.

The previous prime is 242312017. The next prime is 242312047. The reversal of 242312021 is 120213242.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 242312021 - 2² = 242312017 is a prime.

It is a super-2 number, since 2×242312021² = 117430231042208882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242312071) 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, 17307995 + ... + 17308008.

It is an arithmetic number, because the mean of its divisors is an integer number (69232008).

Almost surely, 2^242312021 is an apocalyptic number.

It is an amenable number.

242312021 is a deficient number, since it is larger than the sum of its proper divisors (34616011).

242312021 is an equidigital number, since it uses as much as digits as its factorization.

242312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34616010.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 242312021 is about 15566.3746903381. The cubic root of 242312021 is about 623.4356791604.

Adding to 242312021 its reverse (120213242), we get a palindrome (362525263).

The spelling of 242312021 in words is "two hundred forty-two million, three hundred twelve thousand, twenty-one".