102520514321 has 4 divisors (see below), whose sum is σ = 106055704500. Its totient is φ = 98985324144.

The previous prime is 102520514287. The next prime is 102520514359. The reversal of 102520514321 is 123415025201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86163383296 + 16357131025 = 293536^2 + 127895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102520514321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102520514021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1767595046 + ... + 1767595103.

It is an arithmetic number, because the mean of its divisors is an integer number (26513926125).

Almost surely, 2^102520514321 is an apocalyptic number.

It is an amenable number.

102520514321 is a deficient number, since it is larger than the sum of its proper divisors (3535190179).

102520514321 is an equidigital number, since it uses as much as digits as its factorization.

102520514321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535190178.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 102520514321 its reverse (123415025201), we get a palindrome (225935539522).

The spelling of 102520514321 in words is "one hundred two billion, five hundred twenty million, five hundred fourteen thousand, three hundred twenty-one".