421644102 has 48 divisors (see below), whose sum is σ = 929925360. Its totient is φ = 127357120.

The previous prime is 421644071. The next prime is 421644103. The reversal of 421644102 is 201446124.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421644103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281668 + ... + 283160.

It is an arithmetic number, because the mean of its divisors is an integer number (19373445).

Almost surely, 2^421644102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421644102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (464962680).

421644102 is an abundant number, since it is smaller than the sum of its proper divisors (508281258).

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

421644102 is a wasteful number, since it uses less digits than its factorization.

421644102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909 (or 1898 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 421644102 is about 20533.9743352328. The cubic root of 421644102 is about 749.8631465853.

The spelling of 421644102 in words is "four hundred twenty-one million, six hundred forty-four thousand, one hundred two".