21220222101 has 16 divisors (see below), whose sum is σ = 30709991424. Its totient is φ = 12955771584.

The previous prime is 21220222043. The next prime is 21220222123. The reversal of 21220222101 is 10122202212.

It is not a de Polignac number, because 21220222101 - 2⁷ = 21220221973 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 (21220222301) 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 15 ways as a sum of consecutive naturals, for example, 2137206 + ... + 2147111.

It is an arithmetic number, because the mean of its divisors is an integer number (1919374464).

Almost surely, 2^21220222101 is an apocalyptic number.

It is an amenable number.

21220222101 is a deficient number, since it is larger than the sum of its proper divisors (9489769323).

21220222101 is a wasteful number, since it uses less digits than its factorization.

21220222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4284460.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21220222101 its reverse (10122202212), we get a palindrome (31342424313).

The spelling of 21220222101 in words is "twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, one hundred one".