221121120202 has 4 divisors (see below), whose sum is σ = 331681680306. Its totient is φ = 110560560100.

The previous prime is 221121120161. The next prime is 221121120221. The reversal of 221121120202 is 202021121122.

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., 187654442481 + 33466677721 = 433191^2 + 182939^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55280280049 + ... + 55280280052.

Almost surely, 2^221121120202 is an apocalyptic number.

221121120202 is a deficient number, since it is larger than the sum of its proper divisors (110560560104).

221121120202 is a wasteful number, since it uses less digits than its factorization.

221121120202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110560560103.

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

Adding to 221121120202 its reverse (202021121122), we get a palindrome (423142241324).

The spelling of 221121120202 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, two hundred two".