221213026 has 4 divisors (see below), whose sum is σ = 331819542. Its totient is φ = 110606512.

The previous prime is 221213021. The next prime is 221213039. The reversal of 221213026 is 620312122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 196700625 + 24512401 = 14025^2 + 4951^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221212994 and 221213012.

It is not an unprimeable number, because it can be changed into a prime (221213021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55303255 + ... + 55303258.

Almost surely, 2^221213026 is an apocalyptic number.

221213026 is a deficient number, since it is larger than the sum of its proper divisors (110606516).

221213026 is a wasteful number, since it uses less digits than its factorization.

221213026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110606515.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 221213026 is about 14873.2318613004. The cubic root of 221213026 is about 604.7885571243.

Adding to 221213026 its reverse (620312122), we get a palindrome (841525148).

The spelling of 221213026 in words is "two hundred twenty-one million, two hundred thirteen thousand, twenty-six".