421505424 has 160 divisors (see below), whose sum is σ = 1290096000. Its totient is φ = 131383296.

The previous prime is 421505423. The next prime is 421505437. The reversal of 421505424 is 424505124.

It is a super-2 number, since 2×421505424² = 355333644922839552, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (421505423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 730224 + ... + 730800.

It is an arithmetic number, because the mean of its divisors is an integer number (8063100).

Almost surely, 2^421505424 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 421505424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (645048000).

421505424 is an abundant number, since it is smaller than the sum of its proper divisors (868590576).

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

421505424 is a wasteful number, since it uses less digits than its factorization.

421505424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 421505424 is about 20530.5972635966. The cubic root of 421505424 is about 749.7809280162.

It can be divided in two parts, 42150 and 5424, that added together give a palindrome (47574).

The spelling of 421505424 in words is "four hundred twenty-one million, five hundred five thousand, four hundred twenty-four".