20021122105 has 16 divisors (see below), whose sum is σ = 25445074320. Its totient is φ = 15070892032.

The previous prime is 20021122097. The next prime is 20021122157. The reversal of 20021122105 is 50122112002.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 10845972736 + 9175149369 = 104144^2 + 95787^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021122105 - 2³ = 20021122097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331617 + ... + 387313.

It is an arithmetic number, because the mean of its divisors is an integer number (1590317145).

Almost surely, 2^20021122105 is an apocalyptic number.

It is an amenable number.

20021122105 is a deficient number, since it is larger than the sum of its proper divisors (5423952215).

20021122105 is a wasteful number, since it uses less digits than its factorization.

20021122105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59948.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 20021122105 its reverse (50122112002), we get a palindrome (70143234107).

The spelling of 20021122105 in words is "twenty billion, twenty-one million, one hundred twenty-two thousand, one hundred five".