421403053440 has 128 divisors (see below), whose sum is σ = 1343955402720. Its totient is φ = 112312811520.

The previous prime is 421403053289. The next prime is 421403053457. The reversal of 421403053440 is 44350304124.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 421403053398 and 421403053407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3514152 + ... + 3632088.

Almost surely, 2^421403053440 is an apocalyptic number.

421403053440 is a gapful number since it is divisible by the number (40) 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 421403053440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (671977701360).

421403053440 is an abundant number, since it is smaller than the sum of its proper divisors (922552349280).

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

421403053440 is a wasteful number, since it uses less digits than its factorization.

421403053440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119820 (or 119808 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 421403053440 its reverse (44350304124), we get a palindrome (465753357564).

The spelling of 421403053440 in words is "four hundred twenty-one billion, four hundred three million, fifty-three thousand, four hundred forty".