421440433 has 2 divisors, whose sum is σ = 421440434. Its totient is φ = 421440432.

The previous prime is 421440427. The next prime is 421440449. The reversal of 421440433 is 334044124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217179169 + 204261264 = 14737^2 + 14292^2 .

It is a cyclic number.

It is not a de Polignac number, because 421440433 - 2⁵ = 421440401 is a prime.

It is a super-2 number, since 2×421440433² = 355224077134454978, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421440398 and 421440407.

It is not a weakly prime, because it can be changed into another prime (421440403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210720216 + 210720217.

It is an arithmetic number, because the mean of its divisors is an integer number (210720217).

Almost surely, 2^421440433 is an apocalyptic number.

It is an amenable number.

421440433 is a deficient number, since it is larger than the sum of its proper divisors (1).

421440433 is an equidigital number, since it uses as much as digits as its factorization.

421440433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 421440433 is about 20529.0144186222. The cubic root of 421440433 is about 749.7423903413.

Adding to 421440433 its reverse (334044124), we get a palindrome (755484557).

The spelling of 421440433 in words is "four hundred twenty-one million, four hundred forty thousand, four hundred thirty-three".