102445140521 has 4 divisors (see below), whose sum is σ = 102629064132. Its totient is φ = 102261216912.

The previous prime is 102445140509. The next prime is 102445140569. The reversal of 102445140521 is 125041544201.

It is a happy number.

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 61026785296 + 41418355225 = 247036^2 + 203515^2 .

It is a cyclic number.

It is not a de Polignac number, because 102445140521 - 2¹⁴ = 102445124137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102445142521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91960970 + ... + 91962083.

It is an arithmetic number, because the mean of its divisors is an integer number (25657266033).

Almost surely, 2^102445140521 is an apocalyptic number.

It is an amenable number.

102445140521 is a deficient number, since it is larger than the sum of its proper divisors (183923611).

102445140521 is an equidigital number, since it uses as much as digits as its factorization.

102445140521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183923610.

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 102445140521 its reverse (125041544201), we get a palindrome (227486684722).

The spelling of 102445140521 in words is "one hundred two billion, four hundred forty-five million, one hundred forty thousand, five hundred twenty-one".