102240321 has 4 divisors (see below), whose sum is σ = 136320432. Its totient is φ = 68160212.

The previous prime is 102240289. The next prime is 102240323. The reversal of 102240321 is 123042201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123042201 = 3 ⋅41014067.

It is a cyclic number.

It is not a de Polignac number, because 102240321 - 2⁵ = 102240289 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 102240321.

It is not an unprimeable number, because it can be changed into a prime (102240323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17040051 + ... + 17040056.

It is an arithmetic number, because the mean of its divisors is an integer number (34080108).

Almost surely, 2^102240321 is an apocalyptic number.

It is an amenable number.

102240321 is a deficient number, since it is larger than the sum of its proper divisors (34080111).

102240321 is an equidigital number, since it uses as much as digits as its factorization.

102240321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34080110.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 102240321 is about 10111.3956010038. The cubic root of 102240321 is about 467.5995323170.

Adding to 102240321 its reverse (123042201), we get a palindrome (225282522).

The spelling of 102240321 in words is "one hundred two million, two hundred forty thousand, three hundred twenty-one".