421663320 has 384 divisors, whose sum is σ = 1585059840. Its totient is φ = 100154880.

The previous prime is 421663313. The next prime is 421663327. The reversal of 421663320 is 23366124.

421663320 is a `hidden beast` number, since 4 + 2 + 1 + 6 + 633 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (421663313) and next prime (421663327).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421663327) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5938885 + ... + 5938955.

It is an arithmetic number, because the mean of its divisors is an integer number (4127760).

Almost surely, 2^421663320 is an apocalyptic number.

421663320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421663320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792529920).

421663320 is an abundant number, since it is smaller than the sum of its proper divisors (1163396520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421663320 is a wasteful number, since it uses less digits than its factorization.

421663320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 141 counting only the distinct ones).

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

The square root of 421663320 is about 20534.4422860715. The cubic root of 421663320 is about 749.8745390139.

The spelling of 421663320 in words is "four hundred twenty-one million, six hundred sixty-three thousand, three hundred twenty".