421423656420 has 48 divisors (see below), whose sum is σ = 1270754412480. Its totient is φ = 103735053696.

The previous prime is 421423656419. The next prime is 421423656431. The reversal of 421423656420 is 24656324124.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 270142590 + ... + 270144149.

It is an arithmetic number, because the mean of its divisors is an integer number (26474050260).

Almost surely, 2^421423656420 is an apocalyptic number.

It is an amenable number.

421423656420 is an abundant number, since it is smaller than the sum of its proper divisors (849330756060).

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

421423656420 is a wasteful number, since it uses less digits than its factorization.

421423656420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540286764 (or 540286762 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

The spelling of 421423656420 in words is "four hundred twenty-one billion, four hundred twenty-three million, six hundred fifty-six thousand, four hundred twenty".