221020022122211 has 4 divisors (see below), whose sum is σ = 238021562285472. Its totient is φ = 204018481958952.

The previous prime is 221020022122201. The next prime is 221020022122217. The reversal of 221020022122211 is 112221220020122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221020022122211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221020022122217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8500770081611 + ... + 8500770081636.

It is an arithmetic number, because the mean of its divisors is an integer number (59505390571368).

Almost surely, 2^{221020022122211} is an apocalyptic number.

221020022122211 is a deficient number, since it is larger than the sum of its proper divisors (17001540163261).

221020022122211 is a wasteful number, since it uses less digits than its factorization.

221020022122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17001540163260.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221020022122211 its reverse (112221220020122), we get a palindrome (333241242142333).

The spelling of 221020022122211 in words is "two hundred twenty-one trillion, twenty billion, twenty-two million, one hundred twenty-two thousand, two hundred eleven".