2051321 has 2 divisors, whose sum is σ = 2051322.
Its totient is φ = 2051320.
The previous prime is 2051311. The next prime is 2051323. The reversal of 2051321 is 1231502.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1836025 + 215296 = 1355^2 + 464^2
It is a cyclic number.
It is not a de Polignac number, because 2051321 - 214 = 2034937 is a prime.
Together with 2051323, it forms a pair of twin primes.
It is a Chen prime.
It is a junction number, because it is equal to n+sod(n) for n = 2051296 and 2051305.
It is not a weakly prime, because it can be changed into another prime (2051323) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025660 + 1025661.
It is an arithmetic number, because the mean of its divisors is an integer number (1025661).
22051321 is an apocalyptic number.
It is an amenable number.
2051321 is a deficient number, since it is larger than the sum of its proper divisors (1).
2051321 is an equidigital number, since it uses as much as digits as its factorization.
2051321 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 60, while the sum is 14.
The square root of 2051321 is about 1432.2433452455.
The cubic root of 2051321 is about 127.0606897815.
Adding to 2051321 its reverse (1231502), we get a palindrome (3282823).
The spelling of 2051321 in words is "two million, fifty-one thousand, three hundred twenty-one".