221351426 has 8 divisors (see below), whose sum is σ = 338291964. Its totient is φ = 108587440.

The previous prime is 221351413. The next prime is 221351437. The reversal of 221351426 is 624153122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 170955625 + 50395801 = 13075^2 + 7099^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 221351395 and 221351404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1044005 + ... + 1044216.

Almost surely, 2^221351426 is an apocalyptic number.

221351426 is a deficient number, since it is larger than the sum of its proper divisors (116940538).

221351426 is a wasteful number, since it uses less digits than its factorization.

221351426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088276.

The product of its digits is 2880, while the sum is 26.

The square root of 221351426 is about 14877.8837876897. The cubic root of 221351426 is about 604.9146577250.

The spelling of 221351426 in words is "two hundred twenty-one million, three hundred fifty-one thousand, four hundred twenty-six".