238820064521 has 2 divisors, whose sum is σ = 238820064522. Its totient is φ = 238820064520.

The previous prime is 238820064503. The next prime is 238820064533. The reversal of 238820064521 is 125460028832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226766440000 + 12053624521 = 476200^2 + 109789^2 .

It is a cyclic number.

It is not a de Polignac number, because 238820064521 - 2¹⁰ = 238820063497 is a prime.

It is not a weakly prime, because it can be changed into another prime (238820066521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119410032260 + 119410032261.

It is an arithmetic number, because the mean of its divisors is an integer number (119410032261).

Almost surely, 2^238820064521 is an apocalyptic number.

It is an amenable number.

238820064521 is a deficient number, since it is larger than the sum of its proper divisors (1).

238820064521 is an equidigital number, since it uses as much as digits as its factorization.

238820064521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 238820064521 in words is "two hundred thirty-eight billion, eight hundred twenty million, sixty-four thousand, five hundred twenty-one".