102130021 has 8 divisors (see below), whose sum is σ = 118364544. Its totient is φ = 86306640.

The previous prime is 102129991. The next prime is 102130037. The reversal of 102130021 is 120031201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 102130021 - 2¹⁹ = 101605733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102730021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102250 + ... + 103243.

It is an arithmetic number, because the mean of its divisors is an integer number (14795568).

Almost surely, 2^102130021 is an apocalyptic number.

It is an amenable number.

102130021 is a deficient number, since it is larger than the sum of its proper divisors (16234523).

102130021 is an equidigital number, since it uses as much as digits as its factorization.

102130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205571.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 102130021 is about 10105.9398870169. The cubic root of 102130021 is about 467.4313182296.

Adding to 102130021 its reverse (120031201), we get a palindrome (222161222).

The spelling of 102130021 in words is "one hundred two million, one hundred thirty thousand, twenty-one".