421305500 has 192 divisors, whose sum is σ = 1187536896. Its totient is φ = 126720000.

The previous prime is 421305481. The next prime is 421305503. The reversal of 421305500 is 5503124.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421305503) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1193324 + ... + 1193676.

It is an arithmetic number, because the mean of its divisors is an integer number (6185088).

Almost surely, 2^421305500 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 421305500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (593768448).

421305500 is an abundant number, since it is smaller than the sum of its proper divisors (766231396).

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

421305500 is a wasteful number, since it uses less digits than its factorization.

421305500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 421305500 is about 20525.7277581088. The cubic root of 421305500 is about 749.6623665462.

Adding to 421305500 its reverse (5503124), we get a palindrome (426808624).

The spelling of 421305500 in words is "four hundred twenty-one million, three hundred five thousand, five hundred".