221522006 has 4 divisors (see below), whose sum is σ = 332283012. Its totient is φ = 110761002.

The previous prime is 221522003. The next prime is 221522011. The reversal of 221522006 is 600225122.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221522003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55380500 + ... + 55380503.

It is an arithmetic number, because the mean of its divisors is an integer number (83070753).

Almost surely, 2^221522006 is an apocalyptic number.

221522006 is a deficient number, since it is larger than the sum of its proper divisors (110761006).

221522006 is a wasteful number, since it uses less digits than its factorization.

221522006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110761005.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 221522006 is about 14883.6153538043. The cubic root of 221522006 is about 605.0700062424.

Adding to 221522006 its reverse (600225122), we get a palindrome (821747128).

The spelling of 221522006 in words is "two hundred twenty-one million, five hundred twenty-two thousand, six".