21220221101 has 8 divisors (see below), whose sum is σ = 21289635840. Its totient is φ = 21150920448.

The previous prime is 21220221089. The next prime is 21220221119. The reversal of 21220221101 is 10112202212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21220221101 - 2¹⁴ = 21220204717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220229101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352340 + ... + 408146.

It is an arithmetic number, because the mean of its divisors is an integer number (2661204480).

Almost surely, 2^21220221101 is an apocalyptic number.

It is an amenable number.

21220221101 is a deficient number, since it is larger than the sum of its proper divisors (69414739).

21220221101 is an equidigital number, since it uses as much as digits as its factorization.

21220221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57043.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21220221101 its reverse (10112202212), we get a palindrome (31332423313).

The spelling of 21220221101 in words is "twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, one hundred one".