221221110202 has 4 divisors (see below), whose sum is σ = 331831665306. Its totient is φ = 110610555100.

The previous prime is 221221110161. The next prime is 221221110203. The reversal of 221221110202 is 202011122122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 202011122122 = 2 ⋅101005561061.

It can be written as a sum of positive squares in only one way, i.e., 171661891041 + 49559219161 = 414321^2 + 222619^2 .

It is not an unprimeable number, because it can be changed into a prime (221221110203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55305277549 + ... + 55305277552.

Almost surely, 2^221221110202 is an apocalyptic number.

221221110202 is a deficient number, since it is larger than the sum of its proper divisors (110610555104).

221221110202 is a wasteful number, since it uses less digits than its factorization.

221221110202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110610555103.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221221110202 its reverse (202011122122), we get a palindrome (423232232324).

The spelling of 221221110202 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred ten thousand, two hundred two".