102420085 has 4 divisors (see below), whose sum is σ = 122904108. Its totient is φ = 81936064.

The previous prime is 102420077. The next prime is 102420119. The reversal of 102420085 is 580024201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 580024201 = 73 ⋅7945537.

It can be written as a sum of positive squares in 2 ways, for example, as 14922769 + 87497316 = 3863^2 + 9354^2 .

It is a cyclic number.

It is not a de Polignac number, because 102420085 - 2³ = 102420077 is a prime.

It is a super-2 number, since 2×102420085² = 20979747622814450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10242004 + ... + 10242013.

It is an arithmetic number, because the mean of its divisors is an integer number (30726027).

Almost surely, 2^102420085 is an apocalyptic number.

It is an amenable number.

102420085 is a deficient number, since it is larger than the sum of its proper divisors (20484023).

102420085 is an equidigital number, since it uses as much as digits as its factorization.

102420085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20484022.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 102420085 is about 10120.2808755489. The cubic root of 102420085 is about 467.8734240812.

Adding to 102420085 its reverse (580024201), we get a palindrome (682444286).

The spelling of 102420085 in words is "one hundred two million, four hundred twenty thousand, eighty-five".