421330664 has 8 divisors (see below), whose sum is σ = 789995010. Its totient is φ = 210665328.

The previous prime is 421330661. The next prime is 421330687. The reversal of 421330664 is 466033124.

It can be written as a sum of positive squares in only one way, i.e., 273902500 + 147428164 = 16550^2 + 12142^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (421330661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26333159 + ... + 26333174.

Almost surely, 2^421330664 is an apocalyptic number.

It is an amenable number.

421330664 is a deficient number, since it is larger than the sum of its proper divisors (368664346).

421330664 is a wasteful number, since it uses less digits than its factorization.

421330664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52666339 (or 52666335 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 421330664 is about 20526.3407357473. The cubic root of 421330664 is about 749.6772916842.

Adding to 421330664 its reverse (466033124), we get a palindrome (887363788).

The spelling of 421330664 in words is "four hundred twenty-one million, three hundred thirty thousand, six hundred sixty-four".