421110521 has 8 divisors (see below), whose sum is σ = 454247304. Its totient is φ = 388080000.

The previous prime is 421110439. The next prime is 421110533. The reversal of 421110521 is 125011124.

It can be written as a sum of positive squares in 4 ways, for example, as 19669225 + 401441296 = 4435^2 + 20036^2 .

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 421110521 - 2¹⁴ = 421094137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 421110521.

It is not an unprimeable number, because it can be changed into a prime (421110121) 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, 18230 + ... + 34271.

It is an arithmetic number, because the mean of its divisors is an integer number (56780913).

Almost surely, 2^421110521 is an apocalyptic number.

It is an amenable number.

421110521 is a deficient number, since it is larger than the sum of its proper divisors (33136783).

421110521 is a wasteful number, since it uses less digits than its factorization.

421110521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53131.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 421110521 is about 20520.9775839262. The cubic root of 421110521 is about 749.5467014899.

Adding to 421110521 its reverse (125011124), we get a palindrome (546121645).

The spelling of 421110521 in words is "four hundred twenty-one million, one hundred ten thousand, five hundred twenty-one".