240633821 has 2 divisors, whose sum is σ = 240633822. Its totient is φ = 240633820.

The previous prime is 240633773. The next prime is 240633871. The reversal of 240633821 is 128336042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223502500 + 17131321 = 14950^2 + 4139^2 .

It is a cyclic number.

It is not a de Polignac number, because 240633821 - 2¹⁰ = 240632797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240633871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120316910 + 120316911.

It is an arithmetic number, because the mean of its divisors is an integer number (120316911).

Almost surely, 2^240633821 is an apocalyptic number.

It is an amenable number.

240633821 is a deficient number, since it is larger than the sum of its proper divisors (1).

240633821 is an equidigital number, since it uses as much as digits as its factorization.

240633821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 240633821 is about 15512.3763814575. The cubic root of 240633821 is about 621.9930839828.

Adding to 240633821 its reverse (128336042), we get a palindrome (368969863).

The spelling of 240633821 in words is "two hundred forty million, six hundred thirty-three thousand, eight hundred twenty-one".