421043402 has 16 divisors (see below), whose sum is σ = 703601640. Its totient is φ = 187626432.

The previous prime is 421043383. The next prime is 421043407. The reversal of 421043402 is 204340124.

It can be written as a sum of positive squares in 4 ways, for example, as 319658641 + 101384761 = 17879^2 + 10069^2 .

It is not an unprimeable number, because it can be changed into a prime (421043407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278453 + ... + 279960.

Almost surely, 2^421043402 is an apocalyptic number.

421043402 is a deficient number, since it is larger than the sum of its proper divisors (282558238).

421043402 is a wasteful number, since it uses less digits than its factorization.

421043402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558457.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 421043402 is about 20519.3421434509. The cubic root of 421043402 is about 749.5068770292.

Adding to 421043402 its reverse (204340124), we get a palindrome (625383526).

The spelling of 421043402 in words is "four hundred twenty-one million, forty-three thousand, four hundred two".