20102321 has 2 divisors, whose sum is σ = 20102322. Its totient is φ = 20102320.

The previous prime is 20102311. The next prime is 20102389. The reversal of 20102321 is 12320102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15713296 + 4389025 = 3964^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102321 - 2¹⁴ = 20085937 is a prime.

It is a super-3 number, since 3×20102321³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20102311) 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 as a sum of consecutive naturals, namely, 10051160 + 10051161.

It is an arithmetic number, because the mean of its divisors is an integer number (10051161).

Almost surely, 2^20102321 is an apocalyptic number.

It is an amenable number.

20102321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102321 is an equidigital number, since it uses as much as digits as its factorization.

20102321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20102321 is about 4483.5611961922. The cubic root of 20102321 is about 271.9038776918.

Adding to 20102321 its reverse (12320102), we get a palindrome (32422423).

The spelling of 20102321 in words is "twenty million, one hundred two thousand, three hundred twenty-one".