203421400440 has 64 divisors (see below), whose sum is σ = 610331535360. Its totient is φ = 54239721600.

The previous prime is 203421400439. The next prime is 203421400451. The reversal of 203421400440 is 44004124302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 203421400440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1057377 + ... + 1234863.

It is an arithmetic number, because the mean of its divisors is an integer number (9536430240).

Almost surely, 2^203421400440 is an apocalyptic number.

203421400440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

203421400440 is an abundant number, since it is smaller than the sum of its proper divisors (406910134920).

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

203421400440 is a wasteful number, since it uses less digits than its factorization.

203421400440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187052 (or 187048 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 203421400440 its reverse (44004124302), we get a palindrome (247425524742).

The spelling of 203421400440 in words is "two hundred three billion, four hundred twenty-one million, four hundred thousand, four hundred forty".