421163521 has 8 divisors (see below), whose sum is σ = 431901288. Its totient is φ = 410448000.

The previous prime is 421163473. The next prime is 421163591. The reversal of 421163521 is 125361124.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14737921 + 406425600 = 3839^2 + 20160^2 .

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 421163521 - 2¹¹ = 421161473 is a prime.

It is a super-2 number, since 2×421163521² = 354757422842234882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421163591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36831 + ... + 46891.

It is an arithmetic number, because the mean of its divisors is an integer number (53987661).

Almost surely, 2^421163521 is an apocalyptic number.

421163521 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

421163521 is a deficient number, since it is larger than the sum of its proper divisors (10737767).

421163521 is a wasteful number, since it uses less digits than its factorization.

421163521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11123.

The product of its digits is 1440, while the sum is 25.

The square root of 421163521 is about 20522.2689047776. The cubic root of 421163521 is about 749.5781455778.

The spelling of 421163521 in words is "four hundred twenty-one million, one hundred sixty-three thousand, five hundred twenty-one".