102309021 has 24 divisors (see below), whose sum is σ = 156655680. Its totient is φ = 65989080.

The previous prime is 102309019. The next prime is 102309023. The reversal of 102309021 is 120903201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (102309019) and next prime (102309023).

It is not a de Polignac number, because 102309021 - 2¹ = 102309019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102308985 and 102309003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102309023) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 23976 + ... + 27918.

It is an arithmetic number, because the mean of its divisors is an integer number (6527320).

Almost surely, 2^102309021 is an apocalyptic number.

It is an amenable number.

102309021 is a deficient number, since it is larger than the sum of its proper divisors (54346659).

102309021 is an equidigital number, since it uses as much as digits as its factorization.

102309021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4014 (or 3977 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 102309021 is about 10114.7921876824. The cubic root of 102309021 is about 467.7042427842.

The spelling of 102309021 in words is "one hundred two million, three hundred nine thousand, twenty-one".