102066521 has 4 divisors (see below), whose sum is σ = 108070452. Its totient is φ = 96062592.

The previous prime is 102066491. The next prime is 102066529. The reversal of 102066521 is 125660201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125660201 = 23 ⋅5463487.

It can be written as a sum of positive squares in 2 ways, for example, as 36132121 + 65934400 = 6011^2 + 8120^2 .

It is a cyclic number.

It is not a de Polignac number, because 102066521 - 2¹⁰ = 102065497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (102066529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3001940 + ... + 3001973.

It is an arithmetic number, because the mean of its divisors is an integer number (27017613).

Almost surely, 2^102066521 is an apocalyptic number.

It is an amenable number.

102066521 is a deficient number, since it is larger than the sum of its proper divisors (6003931).

102066521 is an equidigital number, since it uses as much as digits as its factorization.

102066521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6003930.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 102066521 is about 10102.7976818305. The cubic root of 102066521 is about 467.3344219981.

The spelling of 102066521 in words is "one hundred two million, sixty-six thousand, five hundred twenty-one".