221211122101 has 4 divisors (see below), whose sum is σ = 221428209600. Its totient is φ = 220994034604.

The previous prime is 221211122089. The next prime is 221211122131. The reversal of 221211122101 is 101221112122.

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-221211122101 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 (221211122131) 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, 108542221 + ... + 108544258.

It is an arithmetic number, because the mean of its divisors is an integer number (55357052400).

Almost surely, 2^221211122101 is an apocalyptic number.

It is an amenable number.

221211122101 is a deficient number, since it is larger than the sum of its proper divisors (217087499).

221211122101 is a wasteful number, since it uses less digits than its factorization.

221211122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217087498.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221211122101 its reverse (101221112122), we get a palindrome (322432234223).

The spelling of 221211122101 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred twenty-two thousand, one hundred one".