102121321 has 4 divisors (see below), whose sum is σ = 102152772. Its totient is φ = 102089872.

The previous prime is 102121303. The next prime is 102121339. The reversal of 102121321 is 123121201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123121201 = 7 ⋅17588743.

It is an interprime number because it is at equal distance from previous prime (102121303) and next prime (102121339).

It can be written as a sum of positive squares in 2 ways, for example, as 73616400 + 28504921 = 8580^2 + 5339^2 .

It is a cyclic number.

It is not a de Polignac number, because 102121321 - 2¹¹ = 102119273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102121361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10210 + ... + 17563.

It is an arithmetic number, because the mean of its divisors is an integer number (25538193).

Almost surely, 2^102121321 is an apocalyptic number.

It is an amenable number.

102121321 is a deficient number, since it is larger than the sum of its proper divisors (31451).

102121321 is an equidigital number, since it uses as much as digits as its factorization.

102121321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31450.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 102121321 is about 10105.5094379254. The cubic root of 102121321 is about 467.4180450578.

Adding to 102121321 its reverse (123121201), we get a palindrome (225242522).

The spelling of 102121321 in words is "one hundred two million, one hundred twenty-one thousand, three hundred twenty-one".