421221040 has 20 divisors (see below), whose sum is σ = 979339104. Its totient is φ = 168488384.

The previous prime is 421221037. The next prime is 421221071. The reversal of 421221040 is 40122124.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2632552 + ... + 2632711.

Almost surely, 2^421221040 is an apocalyptic number.

421221040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421221040 is an abundant number, since it is smaller than the sum of its proper divisors (558118064).

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

421221040 is a wasteful number, since it uses less digits than its factorization.

421221040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5265276 (or 5265270 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 421221040 is about 20523.6702370702. The cubic root of 421221040 is about 749.6122677343.

Adding to 421221040 its reverse (40122124), we get a palindrome (461343164).

It can be divided in two parts, 4212 and 21040, that added together give a palindrome (25252).

The spelling of 421221040 in words is "four hundred twenty-one million, two hundred twenty-one thousand, forty".