421423412520 has 192 divisors, whose sum is σ = 1427212402560. Its totient is φ = 99401955840.

The previous prime is 421423412503. The next prime is 421423412521. The reversal of 421423412520 is 25214324124.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (421423412521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 145029 + ... + 929451.

It is an arithmetic number, because the mean of its divisors is an integer number (7433397930).

Almost surely, 2^421423412520 is an apocalyptic number.

421423412520 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 421423412520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (713606201280).

421423412520 is an abundant number, since it is smaller than the sum of its proper divisors (1005788990040).

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

421423412520 is a wasteful number, since it uses less digits than its factorization.

421423412520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784496 (or 784481 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 421423412520 its reverse (25214324124), we get a palindrome (446637736644).

The spelling of 421423412520 in words is "four hundred twenty-one billion, four hundred twenty-three million, four hundred twelve thousand, five hundred twenty".