2121222105 has 12 divisors (see below), whose sum is σ = 3676785060. Its totient is φ = 1131318432.

The previous prime is 2121222097. The next prime is 2121222109. The reversal of 2121222105 is 5012221212.

It can be written as a sum of positive squares in 2 ways, for example, as 697593744 + 1423628361 = 26412^2 + 37731^2 .

It is not a de Polignac number, because 2121222105 - 2³ = 2121222097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121222109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23569090 + ... + 23569179.

It is an arithmetic number, because the mean of its divisors is an integer number (306398755).

Almost surely, 2^2121222105 is an apocalyptic number.

It is an amenable number.

2121222105 is a deficient number, since it is larger than the sum of its proper divisors (1555562955).

2121222105 is a wasteful number, since it uses less digits than its factorization.

2121222105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47138280 (or 47138277 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2121222105 is about 46056.7270330839. The cubic root of 2121222105 is about 1284.8784585292.

Adding to 2121222105 its reverse (5012221212), we get a palindrome (7133443317).

The spelling of 2121222105 in words is "two billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred five".