421223666 has 16 divisors (see below), whose sum is σ = 664343640. Its totient is φ = 200014080.

The previous prime is 421223639. The next prime is 421223669. The reversal of 421223666 is 666322124.

It can be written as a sum of positive squares in 4 ways, for example, as 288490225 + 132733441 = 16985^2 + 11521^2 .

It is not an unprimeable number, because it can be changed into a prime (421223669) 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, 55991 + ... + 63066.

Almost surely, 2^421223666 is an apocalyptic number.

421223666 is a deficient number, since it is larger than the sum of its proper divisors (243119974).

421223666 is a wasteful number, since it uses less digits than its factorization.

421223666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119149.

The product of its digits is 20736, while the sum is 32.

The square root of 421223666 is about 20523.7342118826. The cubic root of 421223666 is about 749.6138254894.

The spelling of 421223666 in words is "four hundred twenty-one million, two hundred twenty-three thousand, six hundred sixty-six".