423270821 has 2 divisors, whose sum is σ = 423270822. Its totient is φ = 423270820.

The previous prime is 423270797. The next prime is 423270823. The reversal of 423270821 is 128072324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 250873921 + 172396900 = 15839^2 + 13130^2 .

It is a cyclic number.

It is not a de Polignac number, because 423270821 - 2¹⁰ = 423269797 is a prime.

Together with 423270823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423270823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211635410 + 211635411.

It is an arithmetic number, because the mean of its divisors is an integer number (211635411).

Almost surely, 2^423270821 is an apocalyptic number.

It is an amenable number.

423270821 is a deficient number, since it is larger than the sum of its proper divisors (1).

423270821 is an equidigital number, since it uses as much as digits as its factorization.

423270821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 423270821 is about 20573.5466315363. The cubic root of 423270821 is about 750.8262426151.

The spelling of 423270821 in words is "four hundred twenty-three million, two hundred seventy thousand, eight hundred twenty-one".