421240433 has 8 divisors (see below), whose sum is σ = 449015400. Its totient is φ = 393798400.

The previous prime is 421240429. The next prime is 421240447. The reversal of 421240433 is 334042124.

It can be written as a sum of positive squares in 4 ways, for example, as 2096704 + 419143729 = 1448^2 + 20473^2 .

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 421240433 - 2² = 421240429 is a prime.

It is a super-3 number, since 3×421240433³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421240399 and 421240408.

It is not an unprimeable number, because it can be changed into a prime (421240333) 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, 80618 + ... + 85683.

It is an arithmetic number, because the mean of its divisors is an integer number (56126925).

Almost surely, 2^421240433 is an apocalyptic number.

It is an amenable number.

421240433 is a deficient number, since it is larger than the sum of its proper divisors (27774967).

421240433 is a wasteful number, since it uses less digits than its factorization.

421240433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166467.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 421240433 is about 20524.1426861148. The cubic root of 421240433 is about 749.6237715974.

Adding to 421240433 its reverse (334042124), we get a palindrome (755282557).

The spelling of 421240433 in words is "four hundred twenty-one million, two hundred forty thousand, four hundred thirty-three".