242825921 has 4 divisors (see below), whose sum is σ = 261504852. Its totient is φ = 224146992.

The previous prime is 242825873. The next prime is 242825939. The reversal of 242825921 is 129528242.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105678400 + 137147521 = 10280^2 + 11711^2 .

It is a cyclic number.

It is not a de Polignac number, because 242825921 - 2²⁶ = 175717057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242825941) 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, 9339446 + ... + 9339471.

It is an arithmetic number, because the mean of its divisors is an integer number (65376213).

Almost surely, 2^242825921 is an apocalyptic number.

It is an amenable number.

242825921 is a deficient number, since it is larger than the sum of its proper divisors (18678931).

242825921 is a wasteful number, since it uses less digits than its factorization.

242825921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18678930.

The product of its digits is 23040, while the sum is 35.

The square root of 242825921 is about 15582.8726812485. The cubic root of 242825921 is about 623.8760994208.

It can be divided in two parts, 24282 and 5921, that added together give a palindrome (30203).

The spelling of 242825921 in words is "two hundred forty-two million, eight hundred twenty-five thousand, nine hundred twenty-one".