421821601110 has 384 divisors, whose sum is σ = 1365922381824. Its totient is φ = 87944693760.

The previous prime is 421821601027. The next prime is 421821601121. The reversal of 421821601110 is 11106128124.

It is a happy number.

421821601110 is a `hidden beast` number, since 4 + 21 + 8 + 21 + 601 + 1 + 10 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 319319250 + ... + 319320570.

It is an arithmetic number, because the mean of its divisors is an integer number (3557089536).

Almost surely, 2^421821601110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421821601110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (682961190912).

421821601110 is an abundant number, since it is smaller than the sum of its proper divisors (944100780714).

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

421821601110 is a wasteful number, since it uses less digits than its factorization.

421821601110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788 (or 1785 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

Adding to 421821601110 its reverse (11106128124), we get a palindrome (432927729234).

The spelling of 421821601110 in words is "four hundred twenty-one billion, eight hundred twenty-one million, six hundred one thousand, one hundred ten".