203421420 has 72 divisors (see below), whose sum is σ = 628716816. Its totient is φ = 53219712.

The previous prime is 203421401. The next prime is 203421431. The reversal of 203421420 is 24124302.

203421420 is a `hidden beast` number, since 203 + 42 + 1 + 420 = 666.

It is a super-2 number, since 2×203421420² = 82760548229632800, which contains 22 as substring.

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 = 203421393 and 203421402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1122 + ... + 20201.

It is an arithmetic number, because the mean of its divisors is an integer number (8732178).

Almost surely, 2^203421420 is an apocalyptic number.

203421420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 203421420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314358408).

203421420 is an abundant number, since it is smaller than the sum of its proper divisors (425295396).

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

203421420 is a wasteful number, since it uses less digits than its factorization.

203421420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21391 (or 21386 counting only the distinct ones).

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

The square root of 203421420 is about 14262.5881241800. The cubic root of 203421420 is about 588.1194745425.

Adding to 203421420 its reverse (24124302), we get a palindrome (227545722).

It can be divided in two parts, 203421 and 420, that added together give a triangular number (203841 = T₆₃₈).

The spelling of 203421420 in words is "two hundred three million, four hundred twenty-one thousand, four hundred twenty".