242311021 has 4 divisors (see below), whose sum is σ = 242522332. Its totient is φ = 242099712.

The previous prime is 242310983. The next prime is 242311051. The reversal of 242311021 is 120113242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120113242 = 2 ⋅60056621.

It can be written as a sum of positive squares in 2 ways, for example, as 152250921 + 90060100 = 12339^2 + 9490^2 .

It is a cyclic number.

It is not a de Polignac number, because 242311021 - 2¹³ = 242302829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242310986 and 242311004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242311051) 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, 103926 + ... + 106231.

It is an arithmetic number, because the mean of its divisors is an integer number (60630583).

Almost surely, 2^242311021 is an apocalyptic number.

It is an amenable number.

242311021 is a deficient number, since it is larger than the sum of its proper divisors (211311).

242311021 is a wasteful number, since it uses less digits than its factorization.

242311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211310.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 242311021 is about 15566.3425697882. The cubic root of 242311021 is about 623.4348215382.

Adding to 242311021 its reverse (120113242), we get a palindrome (362424263).

It can be divided in two parts, 24231 and 1021, that added together give a palindrome (25252).

The spelling of 242311021 in words is "two hundred forty-two million, three hundred eleven thousand, twenty-one".