421644101 has 8 divisors (see below), whose sum is σ = 424373664. Its totient is φ = 418922640.

The previous prime is 421644071. The next prime is 421644103. The reversal of 421644101 is 101446124.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421644101 - 2⁶ = 421644037 is a prime.

It is a Duffinian number.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 127991 + ... + 131243.

It is an arithmetic number, because the mean of its divisors is an integer number (53046708).

Almost surely, 2^421644101 is an apocalyptic number.

It is an amenable number.

421644101 is a deficient number, since it is larger than the sum of its proper divisors (2729563).

421644101 is a wasteful number, since it uses less digits than its factorization.

421644101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 421644101 is about 20533.9743108829. The cubic root of 421644101 is about 749.8631459925.

The spelling of 421644101 in words is "four hundred twenty-one million, six hundred forty-four thousand, one hundred one".