102102642 has 12 divisors (see below), whose sum is σ = 221222430. Its totient is φ = 34034208.

The previous prime is 102102641. The next prime is 102102653. The reversal of 102102642 is 246201201.

102102642 is a `hidden beast` number, since 1 + 0 + 21 + 0 + 2 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 101787921 + 314721 = 10089^2 + 561^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 5672369 = 102102642 / (1 + 0 + 2 + 1 + 0 + 2 + 6 + 4 + 2).

It is not an unprimeable number, because it can be changed into a prime (102102641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2836167 + ... + 2836202.

Almost surely, 2^102102642 is an apocalyptic number.

102102642 is an abundant number, since it is smaller than the sum of its proper divisors (119119788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102102642 is a wasteful number, since it uses less digits than its factorization.

102102642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672377 (or 5672374 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 102102642 is about 10104.5851968302. The cubic root of 102102642 is about 467.3895448584.

Adding to 102102642 its reverse (246201201), we get a palindrome (348303843).

The spelling of 102102642 in words is "one hundred two million, one hundred two thousand, six hundred forty-two".