421432340020 has 24 divisors (see below), whose sum is σ = 885062029824. Its totient is φ = 168562628256.

The previous prime is 421432340011. The next prime is 421432340023. The reversal of 421432340020 is 20043234124.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421432340023) 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 7 ways as a sum of consecutive naturals, for example, 304612 + ... + 967291.

It is an arithmetic number, because the mean of its divisors is an integer number (36877584576).

Almost surely, 2^421432340020 is an apocalyptic number.

It is an amenable number.

421432340020 is an abundant number, since it is smaller than the sum of its proper divisors (463629689804).

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

421432340020 is a wasteful number, since it uses less digits than its factorization.

421432340020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288479 (or 1288477 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 421432340020 its reverse (20043234124), we get a palindrome (441475574144).

The spelling of 421432340020 in words is "four hundred twenty-one billion, four hundred thirty-two million, three hundred forty thousand, twenty".