21838201318357 has 2 divisors, whose sum is σ = 21838201318358. Its totient is φ = 21838201318356.

The previous prime is 21838201318321. The next prime is 21838201318363. The reversal of 21838201318357 is 75381310283812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18878060422321 + 2960140896036 = 4344889^2 + 1720506^2 .

It is a cyclic number.

It is not a de Polignac number, because 21838201318357 - 2⁷ = 21838201318229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21838201310357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10919100659178 + 10919100659179.

It is an arithmetic number, because the mean of its divisors is an integer number (10919100659179).

Almost surely, 2^{21838201318357} is an apocalyptic number.

It is an amenable number.

21838201318357 is a deficient number, since it is larger than the sum of its proper divisors (1).

21838201318357 is an equidigital number, since it uses as much as digits as its factorization.

21838201318357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 21838201318357 in words is "twenty-one trillion, eight hundred thirty-eight billion, two hundred one million, three hundred eighteen thousand, three hundred fifty-seven".