21220022105 has 4 divisors (see below), whose sum is σ = 25464026532. Its totient is φ = 16976017680.

The previous prime is 21220022077. The next prime is 21220022119. The reversal of 21220022105 is 50122002212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9500011024 + 11720011081 = 97468^2 + 108259^2 .

It is not a de Polignac number, because 21220022105 - 2¹² = 21220018009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2122002206 + ... + 2122002215.

It is an arithmetic number, because the mean of its divisors is an integer number (6366006633).

Almost surely, 2^21220022105 is an apocalyptic number.

It is an amenable number.

21220022105 is a deficient number, since it is larger than the sum of its proper divisors (4244004427).

21220022105 is an equidigital number, since it uses as much as digits as its factorization.

21220022105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4244004426.

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 21220022105 its reverse (50122002212), we get a palindrome (71342024317).

The spelling of 21220022105 in words is "twenty-one billion, two hundred twenty million, twenty-two thousand, one hundred five".