221423402 has 8 divisors (see below), whose sum is σ = 351672516. Its totient is φ = 104199232.

The previous prime is 221423393. The next prime is 221423417. The reversal of 221423402 is 204324122.

221423402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 208542481 + 12880921 = 14441^2 + 3589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3256193 + ... + 3256260.

Almost surely, 2^221423402 is an apocalyptic number.

221423402 is a deficient number, since it is larger than the sum of its proper divisors (130249114).

221423402 is a wasteful number, since it uses less digits than its factorization.

221423402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6512472.

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

The square root of 221423402 is about 14880.3024834847. The cubic root of 221423402 is about 604.9802165514.

Adding to 221423402 its reverse (204324122), we get a palindrome (425747524).

The spelling of 221423402 in words is "two hundred twenty-one million, four hundred twenty-three thousand, four hundred two".