1021222105 has 4 divisors (see below), whose sum is σ = 1225466532. Its totient is φ = 816977680.

The previous prime is 1021222087. The next prime is 1021222133. The reversal of 1021222105 is 5012221201.

It is a happy number.

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 555827776 + 465394329 = 23576^2 + 21573^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1021222105 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102122206 + ... + 102122215.

It is an arithmetic number, because the mean of its divisors is an integer number (306366633).

Almost surely, 2^1021222105 is an apocalyptic number.

It is an amenable number.

1021222105 is a deficient number, since it is larger than the sum of its proper divisors (204244427).

1021222105 is an equidigital number, since it uses as much as digits as its factorization.

1021222105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204244426.

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

The square root of 1021222105 is about 31956.5659137524. The cubic root of 1021222105 is about 1007.0245748070.

Adding to 1021222105 its reverse (5012221201), we get a palindrome (6033443306).

The spelling of 1021222105 in words is "one billion, twenty-one million, two hundred twenty-two thousand, one hundred five".