421231520 has 48 divisors (see below), whose sum is σ = 1047543840. Its totient is φ = 159623424.

The previous prime is 421231477. The next prime is 421231529. The reversal of 421231520 is 25132124.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 421231492 and 421231501.

It is not an unprimeable number, because it can be changed into a prime (421231529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66242 + ... + 72321.

It is an arithmetic number, because the mean of its divisors is an integer number (21823830).

Almost surely, 2^421231520 is an apocalyptic number.

421231520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421231520 is an abundant number, since it is smaller than the sum of its proper divisors (626312320).

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

421231520 is a wasteful number, since it uses less digits than its factorization.

421231520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138597 (or 138589 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 421231520 is about 20523.9255504399. The cubic root of 421231520 is about 749.6184844793.

Adding to 421231520 its reverse (25132124), we get a palindrome (446363644).

The spelling of 421231520 in words is "four hundred twenty-one million, two hundred thirty-one thousand, five hundred twenty".