801421 has 2 divisors, whose sum is σ = 801422. Its totient is φ = 801420.

The previous prime is 801419. The next prime is 801461. The reversal of 801421 is 124108.

It is a happy number.

801421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756900 + 44521 = 870^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 801421 - 2¹ = 801419 is a prime.

Together with 801419, it forms a pair of twin primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 801395 and 801404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (801461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400710 + 400711.

It is an arithmetic number, because the mean of its divisors is an integer number (400711).

2⁸⁰¹⁴²¹ is an apocalyptic number.

It is an amenable number.

801421 is a deficient number, since it is larger than the sum of its proper divisors (1).

801421 is an equidigital number, since it uses as much as digits as its factorization.

801421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 801421 is about 895.2212017150. The cubic root of 801421 is about 92.8867083087.

Adding to 801421 its reverse (124108), we get a palindrome (925529).

The spelling of 801421 in words is "eight hundred one thousand, four hundred twenty-one".