221249626 has 8 divisors (see below), whose sum is σ = 357403284. Its totient is φ = 102115200.

The previous prime is 221249569. The next prime is 221249647. The reversal of 221249626 is 626942122.

It can be written as a sum of positive squares in 2 ways, for example, as 216119401 + 5130225 = 14701^2 + 2265^2 .

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 = 221249591 and 221249600.

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, 4254775 + ... + 4254826.

Almost surely, 2^221249626 is an apocalyptic number.

221249626 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

221249626 is a deficient number, since it is larger than the sum of its proper divisors (136153658).

221249626 is a wasteful number, since it uses less digits than its factorization.

221249626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8509616.

The product of its digits is 20736, while the sum is 34.

The square root of 221249626 is about 14874.4622087657. The cubic root of 221249626 is about 604.8219096517.

The spelling of 221249626 in words is "two hundred twenty-one million, two hundred forty-nine thousand, six hundred twenty-six".