421810265016 has 224 divisors, whose sum is σ = 1426527638400. Its totient is φ = 114173997120.

The previous prime is 421810265011. The next prime is 421810265047. The reversal of 421810265016 is 610562018124.

It is a happy number.

421810265016 is a `hidden beast` number, since 42 + 1 + 8 + 102 + 6 + 501 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421810265011) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 503751 + ... + 1047561.

Almost surely, 2^421810265016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421810265016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (713263819200).

421810265016 is an abundant number, since it is smaller than the sum of its proper divisors (1004717373384).

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

421810265016 is a wasteful number, since it uses less digits than its factorization.

421810265016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543861 (or 543842 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 421810265016 in words is "four hundred twenty-one billion, eight hundred ten million, two hundred sixty-five thousand, sixteen".