221211202202 has 4 divisors (see below), whose sum is σ = 331816803306. Its totient is φ = 110605601100.

The previous prime is 221211202187. The next prime is 221211202243. The reversal of 221211202202 is 202202112122.

It is a happy number.

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., 158069061241 + 63142140961 = 397579^2 + 251281^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 55302800549 + ... + 55302800552.

Almost surely, 2^221211202202 is an apocalyptic number.

221211202202 is a deficient number, since it is larger than the sum of its proper divisors (110605601104).

221211202202 is a wasteful number, since it uses less digits than its factorization.

221211202202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110605601103.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221211202202 its reverse (202202112122), we get a palindrome (423413314324).

The spelling of 221211202202 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred two thousand, two hundred two".