221121021122 has 4 divisors (see below), whose sum is σ = 331681531686. Its totient is φ = 110560510560.

The previous prime is 221121021083. The next prime is 221121021131. The reversal of 221121021122 is 221120121122.

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., 162633951841 + 58487069281 = 403279^2 + 241841^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221121021122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55280255279 + ... + 55280255282.

Almost surely, 2^221121021122 is an apocalyptic number.

221121021122 is a deficient number, since it is larger than the sum of its proper divisors (110560510564).

221121021122 is a wasteful number, since it uses less digits than its factorization.

221121021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110560510563.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221121021122 its reverse (221120121122), we get a palindrome (442241142244).

The spelling of 221121021122 in words is "two hundred twenty-one billion, one hundred twenty-one million, twenty-one thousand, one hundred twenty-two".