421566647040 has 2304 divisors, whose sum is σ = 1970873856000. Its totient is φ = 84536524800.

The previous prime is 421566647027. The next prime is 421566647041. The reversal of 421566647040 is 40746665124.

It is a tau number, because it is divible by the number of its divisors (2304).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (421566647041) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 6910928610 + ... + 6910928670.

It is an arithmetic number, because the mean of its divisors is an integer number (855414000).

Almost surely, 2^421566647040 is an apocalyptic number.

421566647040 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 421566647040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (985436928000).

421566647040 is an abundant number, since it is smaller than the sum of its proper divisors (1549307208960).

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

421566647040 is a wasteful number, since it uses less digits than its factorization.

421566647040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 45.

The spelling of 421566647040 in words is "four hundred twenty-one billion, five hundred sixty-six million, six hundred forty-seven thousand, forty".