21352525204243 has 2 divisors, whose sum is σ = 21352525204244. Its totient is φ = 21352525204242.

The previous prime is 21352525204223. The next prime is 21352525204261. The reversal of 21352525204243 is 34240252525312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21352525204243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21352525204196 and 21352525204205.

It is not a weakly prime, because it can be changed into another prime (21352525204223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676262602121 + 10676262602122.

It is an arithmetic number, because the mean of its divisors is an integer number (10676262602122).

Almost surely, 2^{21352525204243} is an apocalyptic number.

21352525204243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21352525204243 is an equidigital number, since it uses as much as digits as its factorization.

21352525204243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576000, while the sum is 40.

Adding to 21352525204243 its reverse (34240252525312), we get a palindrome (55592777729555).

The spelling of 21352525204243 in words is "twenty-one trillion, three hundred fifty-two billion, five hundred twenty-five million, two hundred four thousand, two hundred forty-three".