102520042 has 4 divisors (see below), whose sum is σ = 153780066. Its totient is φ = 51260020.

The previous prime is 102520027. The next prime is 102520063. The reversal of 102520042 is 240025201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240025201 = 13 ⋅18463477.

It can be written as a sum of positive squares in only one way, i.e., 100420441 + 2099601 = 10021^2 + 1449^2 .

It is a junction number, because it is equal to n+sod(n) for n = 102519998 and 102520025.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 25630009 + ... + 25630012.

Almost surely, 2^102520042 is an apocalyptic number.

102520042 is a deficient number, since it is larger than the sum of its proper divisors (51260024).

102520042 is an equidigital number, since it uses as much as digits as its factorization.

102520042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51260023.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 102520042 is about 10125.2181211073. The cubic root of 102520042 is about 468.0255817949.

Adding to 102520042 its reverse (240025201), we get a palindrome (342545243).

The spelling of 102520042 in words is "one hundred two million, five hundred twenty thousand, forty-two".