421758508416 has 128 divisors (see below), whose sum is σ = 1293015778560. Its totient is φ = 119309260800.

The previous prime is 421758508411. The next prime is 421758508417. The reversal of 421758508416 is 614805857124.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421758508411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505266 + ... + 1048241.

It is an arithmetic number, because the mean of its divisors is an integer number (10101685770).

Almost surely, 2^421758508416 is an apocalyptic number.

It is an amenable number.

421758508416 is an abundant number, since it is smaller than the sum of its proper divisors (871257270144).

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

421758508416 is a wasteful number, since it uses less digits than its factorization.

421758508416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553632 (or 1553620 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 51.

The spelling of 421758508416 in words is "four hundred twenty-one billion, seven hundred fifty-eight million, five hundred eight thousand, four hundred sixteen".