421234420 has 24 divisors (see below), whose sum is σ = 923053824. Its totient is φ = 161167776.

The previous prime is 421234403. The next prime is 421234423. The reversal of 421234420 is 24432124.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 421234391 and 421234400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421234423) 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, 457404 + ... + 458323.

It is an arithmetic number, because the mean of its divisors is an integer number (38460576).

Almost surely, 2^421234420 is an apocalyptic number.

It is an amenable number.

421234420 is an abundant number, since it is smaller than the sum of its proper divisors (501819404).

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

421234420 is a wasteful number, since it uses less digits than its factorization.

421234420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915759 (or 915757 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 421234420 is about 20523.9961995709. The cubic root of 421234420 is about 749.6202047436.

Adding to 421234420 its reverse (24432124), we get a palindrome (445666544).

The spelling of 421234420 in words is "four hundred twenty-one million, two hundred thirty-four thousand, four hundred twenty".