221210221101 has 4 divisors (see below), whose sum is σ = 294946961472. Its totient is φ = 147473480732.

The previous prime is 221210221091. The next prime is 221210221129. The reversal of 221210221101 is 101122012122.

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 not a de Polignac number, because 221210221101 - 2⁵ = 221210221069 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210221801) 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, 36868370181 + ... + 36868370186.

It is an arithmetic number, because the mean of its divisors is an integer number (73736740368).

Almost surely, 2^221210221101 is an apocalyptic number.

It is an amenable number.

221210221101 is a deficient number, since it is larger than the sum of its proper divisors (73736740371).

221210221101 is an equidigital number, since it uses as much as digits as its factorization.

221210221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73736740370.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221210221101 its reverse (101122012122), we get a palindrome (322332233223).

The spelling of 221210221101 in words is "two hundred twenty-one billion, two hundred ten million, two hundred twenty-one thousand, one hundred one".