421021424 has 20 divisors (see below), whose sum is σ = 821960040. Its totient is φ = 208902720.

The previous prime is 421021423. The next prime is 421021459. The reversal of 421021424 is 424120124.

It is a junction number, because it is equal to n+sod(n) for n = 421021396 and 421021405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421021421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98339 + ... + 102530.

It is an arithmetic number, because the mean of its divisors is an integer number (41098002).

Almost surely, 2^421021424 is an apocalyptic number.

It is an amenable number.

421021424 is a deficient number, since it is larger than the sum of its proper divisors (400938616).

421021424 is a wasteful number, since it uses less digits than its factorization.

421021424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201008 (or 201002 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 421021424 is about 20518.8065929771. The cubic root of 421021424 is about 749.4938356589.

Adding to 421021424 its reverse (424120124), we get a palindrome (845141548).

The spelling of 421021424 in words is "four hundred twenty-one million, twenty-one thousand, four hundred twenty-four".