421023420 has 120 divisors (see below), whose sum is σ = 1326767904. Its totient is φ = 111763584.

The previous prime is 421023419. The next prime is 421023433. The reversal of 421023420 is 24320124.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 421023393 and 421023402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 474217 + ... + 475103.

Almost surely, 2^421023420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421023420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (663383952).

421023420 is an abundant number, since it is smaller than the sum of its proper divisors (905744484).

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

421023420 is a wasteful number, since it uses less digits than its factorization.

421023420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201 (or 1190 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 421023420 is about 20518.8552312257. The cubic root of 421023420 is about 749.4950200700.

Adding to 421023420 its reverse (24320124), we get a palindrome (445343544).

The spelling of 421023420 in words is "four hundred twenty-one million, twenty-three thousand, four hundred twenty".