421551609600 has 648 divisors, whose sum is σ = 1582162328880. Its totient is φ = 98654617600.

The previous prime is 421551609581. The next prime is 421551609631. The reversal of 421551609600 is 6906155124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 67369672 + ... + 67375928.

Almost surely, 2^421551609600 is an apocalyptic number.

421551609600 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 421551609600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (791081164440).

421551609600 is an abundant number, since it is smaller than the sum of its proper divisors (1160610719280).

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

421551609600 is a wasteful number, since it uses less digits than its factorization.

421551609600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6337 (or 6307 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 421551609600 in words is "four hundred twenty-one billion, five hundred fifty-one million, six hundred nine thousand, six hundred".