421403345 has 16 divisors (see below), whose sum is σ = 552061440. Its totient is φ = 306249600.

The previous prime is 421403303. The next prime is 421403357. The reversal of 421403345 is 543304124.

It is not a de Polignac number, because 421403345 - 2¹⁰ = 421402321 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123776 + ... + 127134.

It is an arithmetic number, because the mean of its divisors is an integer number (34503840).

Almost surely, 2^421403345 is an apocalyptic number.

It is an amenable number.

421403345 is a deficient number, since it is larger than the sum of its proper divisors (130658095).

421403345 is a wasteful number, since it uses less digits than its factorization.

421403345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5656.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 421403345 is about 20528.1110918662. Note that the first 3 decimals coincide. The cubic root of 421403345 is about 749.7203965162.

Adding to 421403345 its reverse (543304124), we get a palindrome (964707469).

The spelling of 421403345 in words is "four hundred twenty-one million, four hundred three thousand, three hundred forty-five".