421317216 has 72 divisors (see below), whose sum is σ = 1200568824. Its totient is φ = 140152320.

The previous prime is 421317209. The next prime is 421317217. The reversal of 421317216 is 612713124.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 421317216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421317217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176511 + ... + 178881.

It is an arithmetic number, because the mean of its divisors is an integer number (16674567).

Almost surely, 2^421317216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421317216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (600284412).

421317216 is an abundant number, since it is smaller than the sum of its proper divisors (779251608).

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

421317216 is a wasteful number, since it uses less digits than its factorization.

421317216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004 (or 2993 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 421317216 is about 20526.0131540443. The cubic root of 421317216 is about 749.6693155518.

The spelling of 421317216 in words is "four hundred twenty-one million, three hundred seventeen thousand, two hundred sixteen".