238481829821 has 2 divisors, whose sum is σ = 238481829822. Its totient is φ = 238481829820.

The previous prime is 238481829809. The next prime is 238481829863. The reversal of 238481829821 is 128928184832.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175824230596 + 62657599225 = 419314^2 + 250315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238481829821 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238481829871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119240914910 + 119240914911.

It is an arithmetic number, because the mean of its divisors is an integer number (119240914911).

Almost surely, 2^238481829821 is an apocalyptic number.

It is an amenable number.

238481829821 is a deficient number, since it is larger than the sum of its proper divisors (1).

238481829821 is an equidigital number, since it uses as much as digits as its factorization.

238481829821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3538944, while the sum is 56.

The spelling of 238481829821 in words is "two hundred thirty-eight billion, four hundred eighty-one million, eight hundred twenty-nine thousand, eight hundred twenty-one".