76421 has 2 divisors, whose sum is σ = 76422. Its totient is φ = 76420.
The previous prime is 76403. The next prime is 76423. The reversal of 76421 is 12467.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 45796 + 30625 = 214^2 + 175^2 .
It is a cyclic number.
It is not a de Polignac number, because 76421 - 214 = 60037 is a prime.
It is a Sophie Germain prime.
Together with 76423, it forms a pair of twin primes.
It is a Chen prime.
It is a Curzon number.
It is a plaindrome in base 15.
It is a nialpdrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 76393 and 76402.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (76423) 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 as a sum of consecutive naturals, namely, 38210 + 38211.
It is an arithmetic number, because the mean of its divisors is an integer number (38211).
276421 is an apocalyptic number.
It is an amenable number.
76421 is a deficient number, since it is larger than the sum of its proper divisors (1).
76421 is an equidigital number, since it uses as much as digits as its factorization.
76421 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 336, while the sum is 20.
The square root of 76421 is about 276.4434842784. The cubic root of 76421 is about 42.4363059746.
Adding to 76421 its reverse (12467), we get a palindrome (88888).
The spelling of 76421 in words is "seventy-six thousand, four hundred twenty-one".
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