421355520 has 280 divisors, whose sum is σ = 1522439424. Its totient is φ = 111476736.

The previous prime is 421355509. The next prime is 421355531. The reversal of 421355520 is 25553124.

It is a happy number.

421355520 is a `hidden beast` number, since 4 + 2 + 135 + 5 + 520 = 666.

It is an interprime number because it is at equal distance from previous prime (421355509) and next prime (421355531).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3317697 + ... + 3317823.

Almost surely, 2^421355520 is an apocalyptic number.

421355520 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 421355520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (761219712).

421355520 is an abundant number, since it is smaller than the sum of its proper divisors (1101083904).

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

421355520 is an equidigital number, since it uses as much as digits as its factorization.

421355520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 421355520 is about 20526.9461927487. The cubic root of 421355520 is about 749.6920335595.

It can be divided in two parts, 421355 and 520, that added together give a cube (421875 = 75³).

The spelling of 421355520 in words is "four hundred twenty-one million, three hundred fifty-five thousand, five hundred twenty".