221011221122101 has 4 divisors (see below), whose sum is σ = 221011392700192. Its totient is φ = 221011049544012.

The previous prime is 221011221122011. The next prime is 221011221122141. The reversal of 221011221122101 is 101221122110122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221011221122101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011221122141) 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, 83842155 + ... + 86438008.

It is an arithmetic number, because the mean of its divisors is an integer number (55252848175048).

Almost surely, 2^{221011221122101} is an apocalyptic number.

It is an amenable number.

221011221122101 is a deficient number, since it is larger than the sum of its proper divisors (171578091).

221011221122101 is a wasteful number, since it uses less digits than its factorization.

221011221122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171578090.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221011221122101 its reverse (101221122110122), we get a palindrome (322232343232223).

The spelling of 221011221122101 in words is "two hundred twenty-one trillion, eleven billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred one".