21200430403357 has 2 divisors, whose sum is σ = 21200430403358. Its totient is φ = 21200430403356.

The previous prime is 21200430403343. The next prime is 21200430403403. The reversal of 21200430403357 is 75330403400212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11762300203641 + 9438130199716 = 3429621^2 + 3072154^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200430403357 - 2¹¹ = 21200430401309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200430403157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600215201678 + 10600215201679.

It is an arithmetic number, because the mean of its divisors is an integer number (10600215201679).

Almost surely, 2^{21200430403357} is an apocalyptic number.

It is an amenable number.

21200430403357 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200430403357 is an equidigital number, since it uses as much as digits as its factorization.

21200430403357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 34.

Adding to 21200430403357 its reverse (75330403400212), we get a palindrome (96530833803569).

The spelling of 21200430403357 in words is "twenty-one trillion, two hundred billion, four hundred thirty million, four hundred three thousand, three hundred fifty-seven".