221121102210202 has 4 divisors (see below), whose sum is σ = 331681653315306. Its totient is φ = 110560551105100.

The previous prime is 221121102210193. The next prime is 221121102210209. The reversal of 221121102210202 is 202012201121122.

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., 113052374146881 + 108068728063321 = 10632609^2 + 10395611^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221121102210202.

It is not an unprimeable number, because it can be changed into a prime (221121102210209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55280275552549 + ... + 55280275552552.

Almost surely, 2^{221121102210202} is an apocalyptic number.

221121102210202 is a deficient number, since it is larger than the sum of its proper divisors (110560551105104).

221121102210202 is a wasteful number, since it uses less digits than its factorization.

221121102210202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110560551105103.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221121102210202 its reverse (202012201121122), we get a palindrome (423133303331324).

The spelling of 221121102210202 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred two million, two hundred ten thousand, two hundred two".