802423421 has 2 divisors, whose sum is σ = 802423422. Its totient is φ = 802423420.

The previous prime is 802423393. The next prime is 802423439. The reversal of 802423421 is 124324208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 800097796 + 2325625 = 28286^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 802423421 - 2⁶ = 802423357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (802423481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401211710 + 401211711.

It is an arithmetic number, because the mean of its divisors is an integer number (401211711).

Almost surely, 2^802423421 is an apocalyptic number.

It is an amenable number.

802423421 is a deficient number, since it is larger than the sum of its proper divisors (1).

802423421 is an equidigital number, since it uses as much as digits as its factorization.

802423421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 802423421 is about 28327.0792882005. The cubic root of 802423421 is about 929.2541987754.

Adding to 802423421 its reverse (124324208), we get a palindrome (926747629).

The spelling of 802423421 in words is "eight hundred two million, four hundred twenty-three thousand, four hundred twenty-one".