10521386478181 has 2 divisors, whose sum is σ = 10521386478182. Its totient is φ = 10521386478180.

The previous prime is 10521386478151. The next prime is 10521386478199. The reversal of 10521386478181 is 18187468312501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10405521126081 + 115865352100 = 3225759^2 + 340390^2 .

It is a cyclic number.

It is not a de Polignac number, because 10521386478181 - 2¹⁹ = 10521385953893 is a prime.

It is a super-2 number, since 2×10521386478181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10521386478131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260693239090 + 5260693239091.

It is an arithmetic number, because the mean of its divisors is an integer number (5260693239091).

Almost surely, 2^{10521386478181} is an apocalyptic number.

It is an amenable number.

10521386478181 is a deficient number, since it is larger than the sum of its proper divisors (1).

10521386478181 is an equidigital number, since it uses as much as digits as its factorization.

10521386478181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2580480, while the sum is 55.

The spelling of 10521386478181 in words is "ten trillion, five hundred twenty-one billion, three hundred eighty-six million, four hundred seventy-eight thousand, one hundred eighty-one".