221216026 has 8 divisors (see below), whose sum is σ = 332200800. Its totient is φ = 110482428.

The previous prime is 221216003. The next prime is 221216027. The reversal of 221216026 is 620612122.

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 = 221215988 and 221216006.

It is not an unprimeable number, because it can be changed into a prime (221216027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60576 + ... + 64123.

It is an arithmetic number, because the mean of its divisors is an integer number (41525100).

Almost surely, 2^221216026 is an apocalyptic number.

221216026 is a deficient number, since it is larger than the sum of its proper divisors (110984774).

221216026 is a wasteful number, since it uses less digits than its factorization.

221216026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125588.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 221216026 is about 14873.3327132825. The cubic root of 221216026 is about 604.7912910764.

Adding to 221216026 its reverse (620612122), we get a palindrome (841828148).

The spelling of 221216026 in words is "two hundred twenty-one million, two hundred sixteen thousand, twenty-six".