421020424 has 32 divisors (see below), whose sum is σ = 888963840. Its totient is φ = 185198400.

The previous prime is 421020409. The next prime is 421020427. The reversal of 421020424 is 424020124.

It is not an unprimeable number, because it can be changed into a prime (421020427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74439 + ... + 79894.

It is an arithmetic number, because the mean of its divisors is an integer number (27780120).

Almost surely, 2^421020424 is an apocalyptic number.

421020424 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

421020424 is an abundant number, since it is smaller than the sum of its proper divisors (467943416).

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

421020424 is a wasteful number, since it uses less digits than its factorization.

421020424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154381 (or 154377 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 421020424 is about 20518.7822250737. The cubic root of 421020424 is about 749.4932422652.

Adding to 421020424 its reverse (424020124), we get a palindrome (845040548).

The spelling of 421020424 in words is "four hundred twenty-one million, twenty thousand, four hundred twenty-four".