321420663 has 32 divisors (see below), whose sum is σ = 502745600. Its totient is φ = 202393728.

The previous prime is 321420661. The next prime is 321420713. The reversal of 321420663 is 366024123.

It is not a de Polignac number, because 321420663 - 2¹ = 321420661 is a prime.

It is a super-2 number, since 2×321420663² = 206622485206719138, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321420661) 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 in 31 ways as a sum of consecutive naturals, for example, 221406 + ... + 222852.

It is an arithmetic number, because the mean of its divisors is an integer number (15710800).

Almost surely, 2^321420663 is an apocalyptic number.

321420663 is a deficient number, since it is larger than the sum of its proper divisors (181324937).

321420663 is a wasteful number, since it uses less digits than its factorization.

321420663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908 (or 1902 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 321420663 is about 17928.2085831240. The cubic root of 321420663 is about 685.0010925800.

Adding to 321420663 its reverse (366024123), we get a palindrome (687444786).

The spelling of 321420663 in words is "three hundred twenty-one million, four hundred twenty thousand, six hundred sixty-three".