464321821 has 2 divisors, whose sum is σ = 464321822. Its totient is φ = 464321820.

The previous prime is 464321807. The next prime is 464321849. The reversal of 464321821 is 128123464.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352913796 + 111408025 = 18786^2 + 10555^2 .

It is a cyclic number.

It is not a de Polignac number, because 464321821 - 2¹⁵ = 464289053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (464321881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 232160910 + 232160911.

It is an arithmetic number, because the mean of its divisors is an integer number (232160911).

Almost surely, 2^464321821 is an apocalyptic number.

It is an amenable number.

464321821 is a deficient number, since it is larger than the sum of its proper divisors (1).

464321821 is an equidigital number, since it uses as much as digits as its factorization.

464321821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The square root of 464321821 is about 21548.1280161410. The cubic root of 464321821 is about 774.3542708695.

The spelling of 464321821 in words is "four hundred sixty-four million, three hundred twenty-one thousand, eight hundred twenty-one".