421144021 has 8 divisors (see below), whose sum is σ = 444840704. Its totient is φ = 398079360.

The previous prime is 421144001. The next prime is 421144109. The reversal of 421144021 is 120441124.

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 421144021 - 2⁷ = 421143893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421144021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421144001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156636 + ... + 159301.

It is an arithmetic number, because the mean of its divisors is an integer number (55605088).

Almost surely, 2^421144021 is an apocalyptic number.

It is an amenable number.

421144021 is a deficient number, since it is larger than the sum of its proper divisors (23696683).

421144021 is a wasteful number, since it uses less digits than its factorization.

421144021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316011.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 421144021 is about 20521.7938056107. The cubic root of 421144021 is about 749.5665768333.

Adding to 421144021 its reverse (120441124), we get a palindrome (541585145).

The spelling of 421144021 in words is "four hundred twenty-one million, one hundred forty-four thousand, twenty-one".