421811720 has 64 divisors (see below), whose sum is σ = 1080397440. Its totient is φ = 146713600.

The previous prime is 421811707. The next prime is 421811737. The reversal of 421811720 is 27118124.

It is a self number, because there is not a number n which added to its sum of digits gives 421811720.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10721 + ... + 30960.

It is an arithmetic number, because the mean of its divisors is an integer number (16881210).

Almost surely, 2^421811720 is an apocalyptic number.

421811720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421811720 is an abundant number, since it is smaller than the sum of its proper divisors (658585720).

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

421811720 is a wasteful number, since it uses less digits than its factorization.

421811720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41726 (or 41722 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 421811720 is about 20538.0554094101. The cubic root of 421811720 is about 749.9624988657.

Adding to 421811720 its reverse (27118124), we get a palindrome (448929844).

The spelling of 421811720 in words is "four hundred twenty-one million, eight hundred eleven thousand, seven hundred twenty".