21352525201181 has 2 divisors, whose sum is σ = 21352525201182. Its totient is φ = 21352525201180.

The previous prime is 21352525201157. The next prime is 21352525201193. The reversal of 21352525201181 is 18110252525312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20579523769156 + 773001432025 = 4536466^2 + 879205^2 .

It is a cyclic number.

It is not a de Polignac number, because 21352525201181 - 2³⁸ = 21077647294237 is a prime.

It is a super-2 number, since 2×21352525201181² (a number of 27 digits) contains 22 as substring.

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 (21352525201121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676262600590 + 10676262600591.

It is an arithmetic number, because the mean of its divisors is an integer number (10676262600591).

Almost surely, 2^{21352525201181} is an apocalyptic number.

It is an amenable number.

21352525201181 is a deficient number, since it is larger than the sum of its proper divisors (1).

21352525201181 is an equidigital number, since it uses as much as digits as its factorization.

21352525201181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48000, while the sum is 38.

Adding to 21352525201181 its reverse (18110252525312), we get a palindrome (39462777726493).

The spelling of 21352525201181 in words is "twenty-one trillion, three hundred fifty-two billion, five hundred twenty-five million, two hundred one thousand, one hundred eighty-one".